mimmo - 11:09 pm on Mar 1, 2007 (gmt 0)

So they are saying 10% are invalid. I'd say they are admitting that Click fraud is 10%.

Maybe I missed the point here, but 10% of what?
Does the total include also the Content Network clicks?

On "Google Search" related ads, who has interest on clicking on the ads, beside Google itself or your competitors? I think fraud here is not very high.

On the Content/Search Network it is a different story.

I would not be surprised if "invalid" clicks are something like 30% on the Content Network and 5% on the Google searches.
How about stats by country?

Maybe it is just me ... but I am more concerned about the value of the clicks you are paying for, which Google things are "valid clicks". If they are not converting, they are 100% useless even if "valid clicks".