If people have other suggestions, tell us here. One thing we'd thought of doing was having different colored dots people could put on their nametags if they were looking for a startup or looking for more people for one...
How about "Would Like a Place To Stay" and "Can Host a Hacker", possibly even check boxes on the application form.
If I travel cross country for what could be a life changing weekend, I'd rather spend the down time hanging with like minded people instead of at a Best Western.
(Maybe then someone could throw a web app together to help us find each other)