I'm not sure if this is quite what you're looking for, but I've been working on developing a service that tries to solve this kind of problem. It's project centric with crowdfunding for different "problems" on the project. We've got a coming soon page up now if you'd be interested in taking a look at it, feedback is always welcomed. We should be posting to HackerNews officially in a few days.
http://crowdlink.io/