I'd actually like to see a monthly post along these lines, in the same was as the "Who's hiring" or "Freelancers required/available" posts. I don't think it works as well on a post by post basis but as a collection it'd make for good scanning.
I second this, it sounds like a good way to do it. A monthly thread where people can post projects they'd like help on and a way to get in touch if you're willing to help.
