Hi Aardvarkads-

I have seen the same kind of thing you are talking about with a few of our PPC ads. There are a couple of programs designed to reduce click fraud, check out

http://www.whosclickingwho.com/ &
http://www.keywordmax.com/click_auditor.html

Looks like neither one of them actually prevent fraudulent clicks but they act as monitors to gather information and identify who is clicking your ads. One of them has a deterrent feature.

Does anyone here have any firsthand experience with either of these programs?? I have only limited experience with them. Perhaps people interested in preventing clickfraud would like to hear more about them from other members. Comments anyone?