I have done a presentation on Zimbu at the Reflections | Projections 2009 conference.
The video is available on Youtube: http://youtu.be/XBg-BvJUEnU
You can find the original video on their website: http://www.acm.uiuc.edu/conference/2009/videos.html
The slides can be downloaded from here (PDF).
Note that many details changed since I gave this presentation.