If you haven't seen it yet, Ubuntu is running an interesting brainstorming software called IdeaTorrent to think collectively about common problems and solutions:
The software:
I wonder - would people consider it useful to set up something like brainstorm.wikimedia.org using this software, or would it be too duplicative of BugZilla and listservs? The benefit of IdeaTorrent is that it's very straightforward for non-technical users to contribute ideas and solutions. And, of course, it could be used for non-technical problems as well.