Funny, because I just registered a domain for something like that, ideasbin.com, one day before this thread started. It was a direct inspiration by YC, too: since everybody keeps going on about ideas being worthless, why not "throw away" your idea? It could also be a place to mourn your ideas that you'll never make come true.

My plan was to start simple, though (perhaps reddit style ideas submission, a wiki page for the idea, 'social net' in that people can collect their favorite ideas). Seeing the ideas taking form here, I guess ideasbin would not be too successful (should have picked a more serious domain name).

But anyway, in general I am interested to work on this, although actual time available might be limited. Email in my profile.