[sanderjd]

Except we're talking about structures where there is no management to speak of. If there is strong management, they can just tell people to work on those things as part of their job. I suppose you could extend your idea to a loosely structured company where incentives would be created through consensus.

[Already__Taken]

You could offer straight bounties for the work. Those are great for motivating simple low cognitive tasks and getting good results.