Chris Sherman has the huge write up on Yahoo's settlement of the click fraud case. He describes;
The terms of the settlement include a cash payment of $4.95 million to plaintiffs' counsel and a provision that will allow advertisers to file a claim for Yahoo to investigate potentially fraudulent clicks back through January 2004. Yahoo will pay refunds to advertisers who file claims if it discovers evidence of fraudulent clicks.
Chris explains that the amount does not come close to the $90M Google Settlement but Yahoo is "offering cash refunds, and there is no ceiling on the amount it will refund if it finds evidence of click fraud," where Google offers advertiser credits.