That's a hard one to prove or disprove, MTraX.
If you have AdSense on a page/site, you should certainly see frequent crawls by the AdSense bot, but if you have accurate web logs you should see that identified separately as Media Partners GoogleBot (rather than just Googlebot).
My sites are generally updated fairly regularly so usually I also get regular visits from Googlebot. Since adding AdSense a month or two ago, I can't say I've seen any remarkable change in Googlebot visits - having said that, I have seen a bit of an increase in Googlebot activity but I've also seen increases in visits from the MSN and Slurp spiders in that time period and I doubt that it would be reasonable to attribute that to AdSense.
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