Adwords, Adsense, Adsense blog + others. ( Look for the <script src="/adsense/__utm.js" type="text/javascript"> in the html ) Eating their own dogfood! Heh, actually urchin is pretty good, though at $200/month not for the light walleted. When I saw this the other day I signed up for a free 30 day trial. You don't need to download anything just put that one like of javascript in your html, and Urchin does the rest.