Free Web Analytics Tools

• Google Analytics – most common tool for tracking important metrics
• Google Website Optimizer – conduct A/B Testing and optimize your landing pages for greater conversions
• Piwik – open source analytics tool
• Site Meter – free basic tool
• Stat Counter – a good beginners tool

Paid Web Analytics Tools

• ClickTracks – good ppc campaign management software
• Clicky – comparable to Google Analytics
• Mint –  set it up on your server, does not track conversions
• Indextools – Yahoo web analytics and PPC bid management tools

Enterprise Web Analytics Tools

• Omniture – web analytics,  data discovery, testing and targeting, channel analytics,etc
• WebTrends –  web analytics and consumer-centric marketing intelligence tools