Couchsurfing is a noun and a verb, like Google and google. http://www.couchsurfing.com/ is the website and to couchsurf is to find an available couch in a place you want to go and occupy it. Usually gratis.
There's a lot of buzz about couchsurfing. And Couchsurfing dot com rocks!
Thoughts? Anyone tried it? I love the website. People are raving about couchsurfing...