Have a look at this one. It was presented by Andrew Filev at the UTD PM Symposium. Your feedback on it is welcome in the comments to Andrew's Project Management 2.0 blog.
Last week I attended the @task User Conference in Salt Lake and they made an exciting announcement about a new social project management platform called @task Stream. I thought the ideas presented and the software itself is very revolutionary and falls in line with what social project management is all about. Click this link to see what I'm talking about: social project management.