I’ve been using Google Analytics for most of my websites for quite some time. Philosophically, I’d prefer a self-hosted solution though. In the past I’ve used Webalizer and I still use awstats for my ad-hoc, static website, but these programs are a bit primitive and limited compared to Analytics.
Of the newer programs that I’ve been looking into Piwik looks the most promising to me, but there’s also Obsessive Website Statistics which looks pretty reasonable. W3Perl looks pretty, but seems rather spartan.
I’d have to install Piwik to determine my view…