I guess sort of like this http://www.reddit.com/r/somebodymakethis but maybe more substantial projects, and there would need to be a way for people to say how much they would be willing to pay (and probably pay for it in advance, for that to be a realistic measurement). It would be nice if they could collaborate on refining the idea as well.<p>Kickstarter seems to have something a little like that last part with their rewards, but those concepts are originating with the artists or entrepreneurs rather than the public.
Ask HN: Is there a site for voting on web applications to be implemented? | Heykuki News