Google Analytics is the daddy of all Analytics, it’s used on this site but Yahoo are going to try and force their way into the market with Yahoo Analytics. Yahoo bought IndexTools back in April and they have re-branded the tool for Yahoo. They’ll be rolling it out to customers, partners, developers and advertisers in stages, but there’s no news on a general release.
It seems to work similar to Google Analytics, tracking code, dashboards, goal etc but there are a few standout features flexible custom reports, real time tracking (data comes through in in minutes rather than 24 hours). It all seems really good but we’ll have to get the tracking code in the site before making a decision. Until then Google rules the roost once again.