actually the core PSYC folks have moved on to develop http://secushare.org which is a P2P social beast "done right" with technologies and syntaxes much faster than XMPP or JSON. secushare is getting plenty of attention in the european hacker community and projects like freedombox. it's the missing link basically.

How easy is it to MITM the convergence requests themselves? And does it send all of my web-browsing habits to the notaries? How much money would I have to pay for someone to run a notary for me and would that be safe?