Maybe you can use something like reddit for this purpose.
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I suppose the sincerest form of voting would be merging others' ideas into your working copy. The system could track that and maintain a leaderboard of most-assimilated specs.
I see two challenges in this idea:
- to make a darcs-like tool intuitive to non tech types (lest you filter them out), and
- to represent such specs so the system can track them while keeping them palatable for humans.