I was building a stats script for some of my brandnew sites and I noticed something really astonishing ... a googlebot following my surfing behavior! Is this common practice by Google or should I panic? :-> I'm running Firefox as a browser (no plugins installed). I replaced my own IP address with x.x.x.x.
If you run AdSense I think Google will spider the pages once it knows about them. By visiting your pages you may have been telling Google that the pages exist. If you don't run AdSence then I have no idea.