Here are some best references, sources and Tools for web analytics:
ClickTracks http://www.clicktracks.com/
CoreMetrics http://www.coremetrics.com/
DoubleClick http://www.doubleclick.com/
FireClick http://www.fireclick.com/
Google Analytics http://www.google.com/analytics/
Google Website Optimizer http://services.google.com/websiteoptimizer/
HitsLink http://www.hitslink.com/
Insite http://insiteanalytics.net/
Omniture (SiteCatalyst and HBX) http://www.omniture.com
OneStat http://www.onestat.com/
Quantcast http://www.quantcast.com/
Tacoda http://www.tacoda.com/
Unica http://www.unica.com/
Web Analytics Solution Profiler (WASP) http://wasp.immeria.net/index2.htm
Urchin http://www.google.com/urchin/index.html
Webtrends http://www.webtrends.com/
Xiti http://www.xiti.com/

