Some comments from a private list I'm on full of smart people re interviewing at Google, paraphrased:
1. Don't even apply if you want to have a private office with a door; even the VPs have double offices.
2. If you want to build the next great new Web 2.0 thing, go build it, you don't need Google for that.
3. If you want to telecommute then Google is not your place.
All seem like sound advice, and in some sense very similar to the sorts of interview advice I'd give to anyone working at any rocket-ship Internet company (these would have all worked for Cisco back in the day).