Couple more recommendations

Chat with other people between sessions. Everyone has something that they can teach you, and you can make friends that you can chat with long after the conference

Chat with the speakers. None of them bite.

Chat with the MVPs, PASS directors, Microsoft staff, and anyone else that has special ribbons on their badge. They don't bite either.

Don't be afraid to skip a session and visit the CSS engineers, the vendors, the 'ask the experts', the CAT room, etc. All conference attendees get online access to the session recordings (and you can pay extra for a DVD) so you can still watch sessions missed. Chats with the MS people are invaluable.