Various places where ideas are stored:

  • The Global Ideas Banks: a repository for "socially innovative non-technological ideas and projects" both original and from elsewhere.
  • Should Exist, a non-political tool to share cheap ideas. "Good ideas should be easy to come by. [...] The difficult part is actually implementing."
  • Halfbakery for submitting, commenting on, and rating all manner of ideas, no matter how small.

A co-operative startup could do worse than look at one of these places and start making some of these ideas real.