Yeah I've already been onto the anon+ guys, they're not doing a web based system, they're prefering to re-invent the wheel with a distributed one that requires an installation (why use this when retroshare is available).
Simple because it will require users to install something it's not going to get much of a critical mass IMO.
I would think any kind of system that was going to be useful, get critical mass to get a network effect would have to be no install and web based.
Nefario.