A talk about Web SSO from the authors of SPRESSO is available from 33C3 [0] talking about OATH, OpenID Connect, Mozilla Persona and their solution(SPRESSO) for secure, private formally proofed SSO.
Forgive me for being thick, I read the first page and ran the "demo" but what does it do?
It provides single sign on(SSO) in a decentralized, private manner. For instance you see 'login with facebook/google' buttons all over the web, but that gives FB/Google all sorts of fabulous information about you, and has zero privacy. With Spresso, you can offer the same sort of thing, an identity you can share across many different websites(provided they support spresso), without sharing any information anywhere.