K7 - Kyte

K7 - Unified messaging; voicemail & fax to email - Communicating

Kablogs - Submit & rate special interest articles for bloggers - Rating

Kaboodle - Information sharing - Knowledge

Kadget - Repository of strange widget concepts - Fun

Kakorama - Compose & upload your ringtone for free, find out what happened on the day you were born, plus IM service - VAS

Kalabo - Collaborate on compositions - Productivity

Kaltura - Java CMS - Publishing

Kancept - Submit design concepts and have them reviewed & rated by other users - Design

Kaneva - Digital entertainment marketplace (3D) - Multimedia

Kanga - Free Java CMS - Software

Kanoodle - Sponsored links services - Marketing

Kanosis - Upload your files & use extra apps (MLM) - Storage

Kaosweaver - Dreamweaver extensions - Software

Kapaza~ - Free classified ads marketplace - Ecommerce

Karmadu - Thank people by sending them karma points - Community

Karmus - Create, share & contribute to cards - Community

Kartoo** - Clustered, mapped search - Search

Kast*~ - Visual shopping in many categories from specialized shelfspace (concept deserves better design) - Ecommerce

Kayak - Price comparison with user input for travel - Ecommerce

Kayakbuzz - Find cheap destinations; Google Maps mash-up - Ecommerce

Kayuda - Mindmap tool - Productivity

Kaywa - Publish & share multimedia on web & cell, using sema code - Multimedia

Kcoolonline - Search & download videos - Search

Kdice - Multiplayer strategy game using Google's web toolkit - Gaming

Keegy* - Location aware news generator - News

Keepm - Contact management tool - Office

Keepmytime - Web-based timekeeping - Productivity

Keepvid - Search & download videos - Search

Keepyousafe - Digital safe deposit box - VAS

Keotag - Keyword and tag search - Search

Kepty - Publish about web, get rated & get paid for it - Publishing

Kerpass - Personal security software for web & mobile - Identity

Kerpoof - Synthesize animation film & share it - Video

Kevo - Collaborate on VIP's biographies & gossip - Productivity

Kewego~ - Publish, rate & share videos - Video

Keyworddensitychecker - Visualizes keywords (metatags) in clouds - Tagging

Kickapps - Adds 2.0-things and video to your website - Software

Kickrss - Blend several feeds into 1 - RSS

Kickshype - Submit & rate (articles on) sneakers - Rating

Kidlinkz - Bookmark for your kids - Bookmarking

Kiko - Online calendar - Office

Killerstartups - Digg start-ups - About

Kincafe - Create a community for your family - Community

King - Casual gaming community - Gaming

Kingping - Ping service - RSS

Kinja - Search blogs - Search

Kiptronic - Insert ads in downloadable media - Marketing

Kishkish - Detect lies thru phone - Communicating

Kisstokiss - Dating - Dating

Kissyoutube - Search & download videos - Search

Kitbit* - Publish & share your opinions - Publishing

Kittenauth - Protection against spambots - Software

Kiva*** - Give a micro credit to an entrepreneur from a developing country - Economy

Ki-work - Marketplace, search & platform for project buyers and freelancers in online work - Recruiting

Klabol - Web 2.0 list - About

Klipfolio - Personal portal - Startpage

Klostu* - Connect yourself to all message boards, communities & people - Identity

Kluskring~ - Share ideas & knowledge on DIY - Community

Kmfavorites - Social bookmarking - Bookmarking

Knacktion - Share & sell your talent & content - Economy

Knover - Discover who's connected to what & whom - Dead, Search

Knowbrainers - Q&A - Knowledge

Knowmore - Consumers unite - Economy

Knownow - Connecting data, apps & people - News

Knuru - Natural language search engine - Search

Kodakgallery - Upload, publish & print photo(book)s on demand - Publishing

Koders - Search code - Software

Kolektors - Create, manage, access & share your collections - List

Kollabor8 - Collaborate on image mutations - Dead, Images

Kompoz - Compose & share music together - Productivity

Komuniki - Communicate easily and strengthen your international network - Community

Kongregate - Gamers community - Gaming

Konnects - Networking for professionals - Community

Kontera - In-text advertising - Marketing

Koolanoo - Jewish social network - Community

Koolim - Meta messenger - Communicating

Kooltorch - Provides you with visualized and categorized search results - Search

Koolweb20 - Find & rank 2.0 websites - About

Koolwire - Create PDF files via email - Office

Kopete - Meta instant messenger - Communicating

Koral - Content & document management system - Software

Koreacrunch - Reviews Korean 2.0 companies - About

Kosmix - Vertical search - Search

Kowari - Store, retrieve or analyse metadata - Data

Kramkoob - Submit & share your site, blog, auction, news, vidcast or podcast - Marketing

Krang - Content management system for magazine websites - Software

Kratia - Search, vote & rank results - Search

Krawlerx - Create, search, share & build community around your media - Community

Kraytiv - Bookmark pages relating to creativity - Bookmarking

Kritx - Social reviewing - Dead, Economy

Krop - Job board for creatives - Recruiting

Krugle - Search open source software - Software

Krunch - Email files - Storage

Ksolo - Record & share karaoke songs - Audio

Ktorrents - Search bittorrents - Search

Kudos - Recognize, incentivize, and retain your employees - Recruiting

Kuler - Publish, rate & share colour schemes - Design

Külist - Search, compare, bookmark best prices - Ecommerce

Kuscash* - Mobile digital wallet - VAS

Kweschun - Q&A - Dead, Knowledge

Kwidge - Create funny edit of your photo & share it (PRS) - Photo

Kwizzical - Play quiz & share or donate money - Gaming

Kyte - Create & broadcast TV channels from web or mobile phone - Video