I finished Nanowrimo in 2006 and 2007 (I think? Has it really been that long?) but have been unable to commit to it since because of school (worst possible month if you are in college), but I just graduated in April, so I’ve been thinking about participating again this year. I think have just the right “silly” idea for a book that I probably wouldn’t write otherwise, and that I won’t freak out over if it turns out really awful!
As Becci mentioned, though, I’m always amazed too by some of the amazing books that started life during Nano! So cool!