Google Analytics
Like everyone else on the planet (judging from how slow the service is right now), I signed up for Google Analytics today and put their tracking code in the header of some of the sites I run.
It takes hours before you can see the results of the tracking so I can’t say anything more about it yet, but it looks like a serious web stats tracking system, which is cool because the host I’m using only supports Analog and Awstats, neither of which give you the kind of interactivity that Google Analytics promises.