As Google says that the bot they are using for AdSense - Mediapartners-Google/2.1 - is not indexing pages for the search index. I have bit different experience about it. Many times I try something new - for example a new layout with AdSense - I name the page mostly as testpage.html or php. I do it for just testing and looking if there is something to fix. I was very surprised when I found my testpage from Googles search index. Thing is that there is no link to this page. It exist in my server, but without any link. The only reason why Google would know about it is because the AdSense. Has anyone else noticed anything similar?