zett - 6:37 am on Jul 17, 2007 (gmt 0)

As far as I understand this should only be a problem when Google is (a) counting these artificial ad impressions, and (b) when they use this for determing EPC or SmartPricing. I could imagine that this is not a serious problem to them. It can be, though, with regards to CPM ads and 40,000 pages being spidered... (In this case a lot of invalid views would be generated by those bots.)