A reminder that if you want to receive a credit and join the class action lawsuit against Google. You can earn part of the $60M pot 'deserved' to Google AdWords advertisers who feel they have received "invalid clicks." To submit your request, go to https://www.clicksettlement.com/ and follow the steps.
How do you decide how much to ask for back?
Well, if you have tracking of your own, and it tracks click fraud, you can use that data. Otherwise, I would say, go for 30%. :) You know, based on all those click fraud studies that claim click fraud is as low at 5% and as high as 50%. :)
Still have questions, well you are not alone.
Forum discussion at WebmasterWorld.