Tomorrow 10/12 there will be a open webinar held by James Whittaker.
The topic will cover Exploratory testing done at Google.

"I'll be giving a talk about how we do testing at Google, specifically related to an update on our use of exploratory testing that I introduced at STAR East."

http://www.testingreflections.com/node/view/8386

Could be interresting and I'll try to catch tomorrow.