Quantcast - Open Internet Ratings Service
Who's Counting Clicks, and How - BusinessWeek Online - MSNBC.com
Who's Counting Clicks, and How - BusinessWeek Online - MSNBC.com
Statsaholic: Website Statistics and Website Traffic Graphs
Metrics Market - Internet Statistics Research and Search Engine Marketing tools
comScore Networks: Measuring the Internet Age
PACmeter - Popularity, Authority, Credibility Online: How To Measure Them? - Robin Good' Sharewood Tidings
Creative Good - customer experience consulting, user experience