Looking for a good open source Software Libre alternative to Google Analytics? I can't recommend Piwik highly enough.
- Setup was easy - PHP & MySQL with a simple web based installer.
- Basic mechanism is similar to G.A. - add a code snippet to the bottom of your HTML code and you are done.
- Reporting seems more comprehensive than G.A. - all kinds of interesting data, visitor trails, etc.
- Take back ownership of your stats data!
Have fun.