Ad Traffic Quality Resource Center

Google have created a new resource centre for click quality.

Click quality is the Google euphemism for controlling click fraud (okay okay invalid clicks) and although there does not appear to be any new technical resources on the site, the overview makes very interesting reading for anyone interested in how Google's various layers of click fraud detection work.

The introduction from the site reads:

About the Ad Traffic Quality Resource Center
The relationship between
Google and AdWords advertisers is built on trust. Advertisers rely on the
relevance of our ad placement, our reporting statistics, and the quality of the
clicks their ads receive. We take this trust seriously, and we know that AdWords
couldn't exist without it.
In order to stay abreast of your concerns, we
constantly speak with advertisers and keep a close eye on online advertising
journals and blogs. We've seen that many of you have questions about click fraud
and the impact it might have on your AdWords accounts. In particular, we've
heard your concerns about 'click farms' and the quality of clicks received on
the content network. To help address these and related issues, we've created
this website to aggregate various resources on click fraud.
We hope that you
find this resource center useful. We're still working on expanding the website
and are eager to incorporate your feedback. Feel free to pass along
your suggestions on how it could better suit your needs.