As covered in a recent Rocket Clicks blog post there’s much more motivation for click fraud on the content as compared to search network in Google (and more generally in contextual advertising vs. search advertising). That’s because of the “Adsense Motivation” (site owners make money from clicks).
I asked Rob (our PPC Director) for 10 minutes of his time to review a novel approach to Content Network click fraud which everyone should be attending to, not only because it’s easily eliminated, but because it’s also easy to document and have reversed in your account.
Listed to the MP3 below, and please be sure to read the original Rocket Clicks blog post
Hope it helps,
Glenn 
Podcast: Play in new window | Download
{ 2 comments… read them below or add one }
if your ad isn’t showing because some other ad overlays it, how do you even know that your ad is being overlaid?
For anybody interested, the interview was interesting click fraud info but didn’t really provide anything actionable.