Unfortunately, like scott said above, persona has very poor overall support. The best resources are the official ones:

https://developer.mozilla.org/en-US/Persona

I strongly believe in the protocol, but I have stopped believing in Mozilla to actually do something with it. They have absolute technical gold (yes, it has a couple of issues, they are minor overall) and they just aren't doing anything with it.

I still encourage people to actually implement it because, unlike with centralized protocols, we don't actually need Mozilla for it to work (persona servers are open source and the whole protocol is decentralized). But I have very little faith in ever getting the critical mass necessary for a majority of devs to adopt it without Mozilla promoting it more. (And they were so close, too, with their gmail gateway...)

Seams like a cool system. What do you think about the new Fido standards, U2F and UAF. They solve the same problem but without a third party.