I've written up a little toy in Erlang where you have lots of connections to peers and send dummy messages, all of the same size, to all your peers continuously and then, because of this, you can obviously send a message to whoever you like without anyone being able to know to whom you sent it. With a bit of extra delay you can add retransmission, and then you can have huge networks. Complete resistance to traffic analysis.
The only thing you need to accept to have this kind of security is to accept that message timing might be 1/s, or 0.1/s, but for things like e-mail that isn't a problem at all.
My system is not done. I had intended to finish it if ChatControl 2.0 passed, but since it didn't, and there's upon that a war on I didn't put it out, and I thought it was a bad idea to popularize this kind of thing since there was a war on, but it's quite straightforward. Many here could probably write something like it.