XAuth!

Meebo and some other supporters just released XAuth. The video on page http://xauth.org/info/ is really informative. XAuth provides front-end solution for registration of various web service sessions.

• If you are authenticated to a service, the service puts a registry entry into XAuth local storage.
• Other mashup apps/publisher websites can ask XAuth for a list of web services that the user has been authenticated to. Then the app can adjust UI according to the retrieved data.

In current reference implementation, it requires HTML5 features – postMessage and local storage.

Javascript code: http://github.com/xauth/xauth
Official web site: http://xauth.org/