DATA 2.0 - Update

Since databasing is one of the most important niches in the software market, it's surprising how few pure dbase players I've found so far. Am I missing something? To compensate this a bit, I've dumped my research on treemaps - an attractive trick to present complicated data in one view. Furthermore, many interesting things regarding the presentation of complex data are going on in all kinds of mash-ups...
I've added the former STATS 2.0 entries. Web sites in this category help you to track, trace, analyze, optimize & report on the usage of your web page.

Amazontreemap - Treemap example with "All Digital Cameras"; many more at this link
Ambientdevices* - Datacasting inc. interfaces
Blogbeat - Compare websites' Alexa rankings (formerly known as Alexaholic)
Blogscope - Blog analytics software
Clearforestsws - Semantictextanalysis2XML
Clicktale - Analyse blog traffic
Crazyegg - Watch users' click paths as a movie
Data360 - Find, present & share data
Datamashups - Create mash-ups & apps
Delexa - Test effectiveness of your website
Delineate - Ranks top websites with Delicious tags & Alexa data
Flexdirectory - List people, groups, jobs
Flickrgraph** - Visualize your network on Flickr
Googleanalytics - Folksonomied visitor stats
Googletrends - Site analytics software
Hivegroup - Treemap specialist
HivePM - Treemap for product management
HivePPM - Treemap for purchasing performance management
HiveSM - Treemap for sales management
Honeycomnewsmap* - News treemap
IP2location - Create trend charts for site traffic
Itunestreemap - Track the iTunes Top 100 songs as they move up and down the charts
Kowari - Store, retrieve or analyse metadata
Lazybase - Create, manage & share databases
Livepagerank - Track your site visitors geographically
Mapstats - Check your PR
Mapsurface - Map blog traffic
Measuremap - Web stats
Merit - Treemap for Marine Corps Equipment Readiness Information Tool
Mint - Blog stats
Moodviews~ - Site analytics software
Mybloglog - Stats for LiveJournal moods
Peetscom - Treemap product comparison
Perspectives** - Visualizes spatio-temporaly the places we inhabit
Popuri - Check popularity of any site
Powehousemuseum - Contribute to museum object folksonomy
Regger - Datamine your blog
Robotreplay - Record & watch your website visitors in action
Scribefire (formerly: Performancing) - Blog analytics
Sitemeter - Blog metrics
Socialcircles* - Visualizes relations in an email database
Statcounter - Web stats
Statsaholic - Create & share applications
Swivel - Publish & share data
Touchgraph* - Visualize online data
Trendalicious - Web stats
Turbodbadmin - Online dbase in Ajax
Urinfo - Real time website popularity trends
Wholinked - Pagerank tool

Italic = new. Updated 061221, 070119, 070303, 070517.