If I were you I would be more interested in companies that were started, got some traction and sold out for low double digit millions only to be shut down by th

If I were you I would be more interested in companies that were started, got some traction and sold out for low double digit millions only to be shut down by their acquirer. Fflick, for example, was a really interesting idea and seemed to be getting some play - now it's gone. Dodgeball -> Foursquare, etc. Edit: Whoops - I didn't read the OP closely. I thought you were only looking for ideas/ business models, but obviously this would not work for codebases.