Already implemented a few times, we have an implementation that is below critical mass after months of running. Some key aspect of it is still missing :(
Jaanix isn't really what I have in mind, though it is hard to explain why. The problem I think may be a combination of interface, the basic conceptual decisions, and the chicken-and-egg problem. To get a site like this to work may require a big initial splash of publicity, as well as a very strong, subtle design.
