I have been using google analytics for some time now (Urchin), but the truth is, although it is very very nice, i lack control.
What amuses me is how good an open source alternative piwik (piwik.org) is.
And all of the stuff PIWIK offers, they still consider it new and incomplete, that is strange, it does everything i ever asked for from google’s own analytics.
Anyway, once i use it for a while, i am thinking of making the hosted service available to the public, on the condition that it can be modified to become a distributed system that is scalable 