The general gaming site Gamers.Com has made a listing of the various companies attending E32K. Here's what they had to say about Bungie's booth:

Speak softly and carry a big stick. A very big stick. A very big stick named Halo . Bungie's booth was extremely plain; sporting little more than a single Dreamcast with a playable Oni and a large theater, you wouldn't have guessed that Bungie was stealing a lot of the buzz at E3. For such a small booth, there was an extremely long line of people lining up to get into the Halo presentation. At the entrance stood many gamers cringing with anticipation, while at the exit a shocked look of disbelief was on everyone's face.

The page this quote comes from curiously has separate links to the PC and Mac versions for Oni and Halo. Even curiouser, they're already accepting user ratings as to the quality of not-yet released games. Gamers.Com is relatively new, and someone I know who has done some peripheral work for them has high hopes for the site.