Tycho and Gabe were invited to the Xbox Live Boot Camp, and they've done a writeup of their impressions today, as well as a Halo-related comic. From the writeup:

As it turns out, Gabe and I had nothing to fear from Microsoft, or even from Bungie when we went through there (very quietly). It was just as my experience had been with Kelly Flock, when I talked to him. People who believe sincerely in what they are doing don't mind if you tease them, because they they had real reasons for making the decisions they did. They were nothing but polite, and very forthcoming with things to eat.

Kudos to Louis at HBO for the heads-up.