Mozilla's BrowserID (single sign-on for the web) is live
A lot of questions here revolve around how this is different from OpenID and single sign-on solutions like Google Accounts or Facebook Connect. Here's a rough list (may be incomplete or inaccurate by now; while I work for Mozilla, I'm not involved in this project):* federated (like OpenID)* open standard (like OpenID)* no passwords / no typing / no memorizing (e.g. like FB Connect)* possibility of browsers providing an integrated experience (technically possible with previous solutions, but no browser has done this so far -- in the case of OpenID for a very good reason IMHO)* anonymity/choice of identities (like OpenID, definitely unlike e.g. FB Connect)* no exposure to identity provider (this is unlike any existing solutions; if you log into a site, your OpenID provide, Facebook, Google, etc. will know which site it was; not with BrowserID!)Check out Dan and Ben giving a nice demo of the BrowserID user experience: http://www.youtube.com/watch?v=6x45Nt1fOMM. No passwords, no typing, and anonymity where desired.If you're interested in the nitty gritty details, Lloyd explains the cryptographic assertions that actually let sites verify your identity: http://lloyd.io/how-browserid-works(EDIT: format bullet points)