April 7, 2010 update
Fragment of a discussion from Talk:Task force/Analytics
Checking it out. I don't know much about this area. Does this only measure traffic? There are a lot of other analytics that would help us.
Piwik is oriented toward traffic analysis, although it could potentially be extended for other uses. We see it as a potential first step, not as a catch all. Check out Task force/Analytics/Requirements and make sure the other analytics you'd like to see captured are recorded/linked there. I know many were discussed in the community health task force.