You can follow the Interaction08 backchannel on Twitter, if you're so inclined. The best comment so far came from my former coworker Keith "it depends" Instone, who joined with others in complaining on Twitter about the noise from the sponsor area bleeding into the speaker area. When it finally quieted down, he said:
i guess we just used a twisper - a way to tell someone on the other side of the room to hush up
I wasn't in the morning sessions in that part of the conference, but I did notice that after lunch, things quieted down pretty quickly...