(Semi-)Official OSCON Wiki Online
Related link: http://oscon.kwiki.org/
Ingy's generously created a new Kwiki to keep track of all of the incidentals that fly through the air at a conference. The Wiki's a place to talk about everything from sharing rooms to getting rides to and from the airport to what's going on right now in a talk.
This is the best place to talk about OSCON as it's going on right now. Find out the best places to eat from Portland natives. Meet up with like-minded people at an off-the-cuff BOF. Keep notes on speakers and sessions. Post links to your journal and weblog entries.
Based on the success of the YAPC::NA Wiki, you'll kick yourself if you don't keep an eye on what's happening!