Search Trends - Search Engine Marketing

I noticed some very unusual activity in my Yahoo account for one of my sites a couple days ago. Several hundred clicks came in on a keyword that normally generates a few clicks a day. The traffic resulted in zero leads, which leads me to believe it's some kind of click fraud.

I just read this post on SERoundtable that makes me wonder just how widespread this was.

I got a similar response to what other forum posters received, but they did offer to refund part ($100) of the $325 I was charged for the (apparently fraudulent) clicks. And since I didn't actually call (I emailed), I didn't get laughed at.