this post by Aidan Chopra, SketchUp Evangelist, on the SketchUp blog.
From what I can tell/what I have heard, it was a blast. There were about 250 attendees (a handful were geo-modelers) who split their time between the Google Boulder Office and a second location called the Milk factory (?) or something like this.
I have been to Google Boulder but I am unfamiliar with the *Milk factory. Possibly Google Milk is coming to a breakfast table near you. Like I said I wasn't there, this is all just speculation.
*UPDATE: The secret location is called the Dairy Center. Does this clear anything up?