What is the mysterious GG?

Original expose (in French)
At Blogoscoped

It's a version of the search results that throws up extra data, for internal use only. Conspiracy theorists are yet again suggesting that buying AdWords ads boosts your organic rankings (never made any difference to any of my sites!). Google's official answer, from Matt Cutts is:

It is a tool used by members of our AdWords sales team to help prioritize new customer acquisition.

...suggesting that the GG figure is something like "we could earn this much per 100,000 impressions from these folk if they joined AdWords".

To me the most interesting part is official proof of Google categorizing sites.