My post last week talked about some simple research I do weekly on companies who click on my PPC ads. My goal is to find out how many times competitors click on our ad. Yesterday, the Google Adwords blog posted a good article on their extensive click-fraud detection methods. The article is worth your time and goes into pretty good detail.
One thing I did not mention on my original post which I should have is Google’s Invalid Clicks report in the Reports section of the Adwords interface. I use this often because I get a good idea of the rate of invalid clicks on my campaign. The screen shot below shows where to indicate you want those stats in your report.