FYI - I personally hunted down two more attendees to help with OSGeo stuff. (that means two more t-shirts :). They have been added to the Shirts page already, but just thought I'd mention that. I am aiming to get 5-6 more people - by personally hunting them down. So aim high for # of shirt orders Michael.
One of those people is John Graham from Telascience - he will be coming now. He'd have some interesting stuff to present, I bet if there was a spot for him to do it. (Thinking of the work a bunch of them did around Katrina imagery stuff). Still waiting to hear back from a few others.
I did a rought count and think we'll have over 20 OSGeo boosters at the conference. Our shirts are going to be more than obvious 
As well, we've got enough people for at least one team at for the pre-conference game:
http://wiki.oreillynet.com/where20_2006/index.cgi?PixieHunt
Momentum is building
Tyler