SEARCH 2.0: More than threehundred algorithmed, tagged, folksonomied, vertical, clustered, visualized search & recommendation engines

Don't ask me why, but this is one of the most crowded categories;-). Search inspires many students & academics to come up with something new, although often just for play. My bet is that a few vertical and a few clustered search concepts stand a very tiny chance to work themselves out of Google's shadow. Folksonomy-based search seems interesting too, but it's victim to a chicken or egg-dilemma: to make it really work they first need massive usage...

More than 60 additions in this update, in italic.

1000tags - Tag cloud based search
A9** - Clustered search
Academiclive - Search academic articles
Accoona - A.I. Enhanced search
Adaction - Search me
Aduna~ - Visualize search results
Aftervote - Meta search inc several rankings
Aftervote - Meta search inc several rankings
Ajaxwhois - Results while you type
Alamy - Search stock images
Albumart - Search for CD and DVD covers
Alpinaut - Search route maps
Ambedo - Bookmark, tag & search
Anoox - Majority vote optimized search
Aolvideo - Search video
Askalexia - Ajax interface to Alexia.com
Audioclipping* - Search AV (German)
Aytozon - Ebay + Amazon metasearch
Bashr - Wikipedia, Flickr & Delicious mash-up
Become - Collective shopping search
Bessed - Search & blog
Bibster - Search, share & manage bibliographic metadata
Big - Big search results
Biggerboat - Search entertainment
Blogbar - Searches your blog and the web
Blogbuzzmachine - Blog search
Blogcatalog - Blog directory
Blogpulse - Search blogs
Blogrovr - Get links to context relevant blog articles while you're browsing
Bluedot (formerly: Blue) - Find & share
Boardreader - Forum & bulletin board search engine
Boardtracker - Search forums
Brandgossip*~ - Find what people say about your brand
Browster - Search & browse instantly
Bustaname* - Domain name checker
Byoms - Personalized IM search agents on your cell
Chacha* - Get real time results with help of live guides
Cityfeeds - Find what's happening in a city now
Cliproller - Search video & get recommendations
Cloudee - Aggregates news per term
Clusty - Cluster results in folders
Collaborativerank - Search & rank
Collarity - Customize your search & find people with similar search interests
Colrpickr - Search Flickr photos based on their color
Compete - Get info on sites' traffic, offers and trustworthiness
Congoo - Search and preview premium content for free
Cooliris - Search within search (client)
Copernic - Search app
Cranky - Search & rate in this age relevant senior search engine
Daypop - Search news
Decipho - Clustered search
Deepquerymanager - Search, share & manage info from the deep web
Digforit - Meta search
Digitalmediasearch - Search media
Digitalpodcast - Search podcasts
Ditto - Search images
Domainsbot - Domain search & suggestions
Doubletrust - Google + Yahoo mash-up
Downthisvideo - Search & download videos
Dumbfind - Search words + tags
Egosurf - Search yourself, get ranking
Ekoss - Semantic search for engineers
Everythingweb20search - Web 2.0 search
Exalead** - Unified search technology
Extate - Property search engine (UK & SA)
Eyesearch - Search results presented in mini thumbs
Ez2find - Meta search
Factbites - Search results in sensible sentences
Famfamfam - Search icons
Faroo - Become part of a search infrastructure (client)
Fedsifter - Search feeds
Feedshot - Optimize findability of your blog
Feedster - Search for feeds
Feedzie - Finds feeds & casts
Filangy - Current search
Findsounds - Search for sounds
Fintag - Finds LSE stocks
Flickr-storm - Fuzzy search engine for Flickr photos
Flowser - Visual Amazon search
Fooooo - Search +20M videos
Franchisegator - Ajaxified franchise search & match
Fundooweb - Meta search
Futef - Clustered search on Wikipedia
Fybersearch - Web and feed search
Gadabe* - RSS metasearch (relaunched as Tagjag)
Gahooyoogle - Google + Yahoo mash-up
Geourl - Location 2 URL directory
Gettalink - Search & get visual links
Gnoos - Blog search
Gnosh - Meta search
Gnowsis - Semantic desktop
Gokita* - Clustered meta search (no advertising)
Goodsearch - 50% of ad revenues for a charity designated by you
Googdesk - Meta search
Google* - Search & adwords
Google411 - Voice rec-based search
Googleblogsearch - Search blogs
Googlecustomesearch - Create your own vertical search with Google
Googleimages - Search images
Googlemobile - Search, email & rss reader
Googlerelatedlinks - Related links service for your web page
Googletoolbar - Social search
Graball - Meta search
Gravee - Searches sites & blogs; fair rev share on ads
Gridwell - Search; results with icons
Hakia - Meaningful results
Healia - Health search engine
Healthline - Contextual search for health information
Highfivez - Blogosphere search engine
Hotdaddy* - Search engine aggregator
Huckuback - Meta search
Iamsearched - Are you googled-notification service
Ibegin - Local search
Icerocket - Search blogs & web
Iconbuffet - Search icons
Iconfinder - Icon search engine
Instantdomainsearch - Ajax domain search + suggestions
Ipselon - Meta search
I-spy - Community based meta search
Jobpile - Job search engine
Jobsearcheasy - Job search engine, win prizes
Jookster - Search, rank & share
Juststepsaway - Deep filtered vertical search for vacation rentals
Jux2 - Meta search
Kartoo** - Clustered, mapped search
Kcoolonline - Search & download videos
Keepvid - Search & download videos
Keotag - Keyword and tag search
Kinja - Search blogs
Kissyoutube - Search & download videos
Knover - Discover who's connected to what & whom
Kosmix - Vertical search
Kratia - Search, vote & rank results
Lexxe - Meaningful search
Lijit* - Social contextual search
Like - Find article you want and do a likeness search
Linkedwords - Search with context
Linkput - Results with sure input
Lirama~ - Upload, explore & share song lyrics
Liszen - Search blog articles for librarians
Livedoorsearchbox - Search in IE window border
Liveplasma* - Search & find other things to your taste
Livesearch* - Refine your search while you type
Loki* - Search & navigate web & real life
Longtimelost* - Find back lost friends thru Google
Lumrix - Semantic search engine
Majestic12* - Distributed search engine
Makidi - Search for people (?)
Mamma - Meta search
Matchmypet - Find a date for your pet
Mb3dengine - Animated Digg-cloud
Medgle* - Medical search
Meevee - Search, upload, share, review & vote tv content
Metatube - Search +100 video sharing sites
Mnemo - Refine your search terms
Mobilcast - Search podcasts
Monitor110** - One-stop semantic financial research suite
Mooter - Clustered search
Musestorm*** - Metasearch in Flash (several interfaces)
Musicmap - Search & find other things to your taste
Mybigriver - Find while you type; Amazon mash-up
Newroo - Memetracker (Stealth)
Nextaris - Social search
Nnseek - Forum search engine
Nnseek - Forum search engine
Oihoi - First specify category, then search
Omgili - Search discussion forums
Oodle - Find local classifieds
Oozm - Search refined by people
Opinmind - Connect opinions to people (bloggers)
OPMLsearch - Dedicated OPML search
Opsdo - Meta search
Otavo - Collaborative web search
Outfoxed - Social search
Pagebull - Visual search
Pico - Search multimedia
Picsearch - Meta search on pics
Picturesandbox - Photo & video search
Pipl - Search for people
Pixelperfect - Search stock images
Pixsy - Ajax-based image search
Podcastdirectory - Search podcasts
Podcastnet - Search podcasts
Podcastsearchservice - Find podcasts
Podfeet - Find casts
Podnova - Find podcasts
Podscope - Find podcasts thru text search
Podscope - Voice rec-based audio and video search engine
Praseus - Page rank based search
Prefound - Search & share what you've found
Previewseek*** - Byebye Google? (Coming back soon)
Pssdir - Create & publish your own search engine or web directory
Pubsub - Search + profiled alerts
Pulverati - Create & share RSS feed search
Puzzr - Vertical search
Qelly - Meta search engine - Search
Qksearch - Meta search for verticals (web, jobs, etc.)
Qoogle - Video search
Q-phrase - Search solutions (clients)
Qtsaver - Micro content search; Google & Yahoo mash-ups
Qtsearch - Search for content in Yahoo & Google
Quantcast - Site stats
Qube - Search engine aggregator (client)
Quece - Conversational search
Quintura - Search strange site names
Qwika - Search wikis
Readon* - Have your video captioned for search purposes
Releton - Google + Yahoo + maps & routes
Reply - Get info on value of homes & cars in USA
Resultr - Meta search with agents
Retrevo - Meta product search
Retrievr* - Search images by sketching
Riya* - Face recognition based photo search
Rollyo* - Create search agents
Rootly - Refine your news search
Rssmicro - Feed search
Scoopgo~ - Create & maintain news search agents
Scroogle - Google without ads & other evil
Searchcrystals - Visualise your search
Searchfeedr - RSS feed search
Searchforvideo - Search video
Searchmapr - Cluster your search results in treemap
Searchmash - Ajaxified search playground for Google
Searchvideo - Search video
Seekum - User ranked search results
Semantical - Semantic search engine software - Search
Shopwiki - Search 120,000 stores
Sidekiq* - Hyper meta search
Similicious - Search for similar websites
Simplygoogle - Everything Google on 1 page
Skuer - CSS search engine
Snaket - Clustered search
Snap - Ajax search, shows found pages
Snunk - Search & vote
Socialgrapes - Find & keep track any member of any social network
Sphere - Search the blogosphere
Sproose - Personalize search results & share them
Squurl - Rapid domain search - Search
SRC - Clustered search
SRC - Clustered search with RSS alerts
Srobbin - Search Google Video on your cell
Stalkerati - Meta search for people
Stockpert - Search stock images
Stockphotofinder - Search stock images
Streakr* - Stumble upon, rate & share content from social media
Suckingfish - Save, collaborate on & publish search results
Sullr* - Reversed mobile phone number search
Surfwax - Multisource search
Swamii - Create cross media search agents
Swicki - Search with user input
Swoogle - Semantic web search engine
Sxc - Search stock images
Tagbulb - Meta tag search
Tagfetch - Folksonomy meta tag search
Tagground - Search for URLs by tag or v.v.
Tagjag - Meta search (formerly Gada.be)
Tagnautica - Search Flickr
Talkdigger - Search & discuss results from blogs & web
Tallstreet - Trade search results like stock market
Technorati* - Find what people are saying
Technoratikitchen - Saerch for microformats
Tellme - Search businesses thru voice, get rich info or text back
Thedailyplate - Search food & find healthiest options
Thefind - Shopping search
Tiltomo - Search for similar photos
Toptensources - Startpage
Tubesurf - Search video
Tunefind - Submit & find film & tv music
Twerq* - Remember search results in tabs
Ujiko** - Visual your search, manipulate results, manage your reputation (by the wizards from Kartoo); the more you use it, the more cool features you get
Universe** - Presents search results in stellar clouds
Urlfan - Real time blog reference search
Vast - Car search
V-enable - Mobile speech search
Videodl - Search & download videos
Videodownloader - Search & download videos
Videoronk - Meta video search
Videotag - Play video tagging game & enrich their search database
Viewscore - Product search & comparison engine
Vivisimo - Clustered search
Wampad - Experiments in speed search
Watson - Add contextual search to all documents
Watvindenwijover~ - Find & vote for information
Waypath - Search blogs
Webaroo - Search the wen offline - Search
Webmunism - Search media & knowledge in self-organizing categories
Who-isit - Whois, ping, check link popularity
Whonu - Discover/search content (more) intuitively
Widgetbox - Directory for web widgets
Wikimindmap* - Search wiki content with mindmap interface
Wink - Folksonomied search
Winzy - Search & win prizes
Xcavator - Search & sort images
Yahoovideosearch - Search video
Yellowbook - Yellow pages aggregator
Yoono - Search, exchange & share information
Yoople - Search & collaborate on improving search results
Youtubedownloader - Download & save Youtube videos
Youtubedownloads - Search & download videos
Youtubex - Search & download videos
Youtubia - Search & download videos
Yubnub* - Search & share search commands
Zeedex - Search with suggestions
Zigtag - Search, save & share results
Zoomf - Search with map mash-up
Zuggest - Meta search engine
Zuula - Meta search (web, images, news, blogs, jobs)

Italic = new. Update 061224, 070119, 070303, 070517 (corrected 070527), 060826.