OpenID (http://www.danga.com/openid/), developed by the creators LiveJournal, is another attempt at a single sign-on system. The system is similar TypeKey and Password, but focused more towards blogs and promises to actually be "distributed".
"An OpenID-enabled site/blog lets you authenticate using your existing login from your homesite (whether that's on your own server or a hosted service) without giving away your password to the 3rd-party site you're visiting, or making a new account there, or giving away your email address. And it's secure, and can run entirely in the browser without extensions, without moving between pages."
The overview mentions the possible use of SAML, which might be of interest to the conversation of about placing XML services in Ajax thread.
There is also a demo available using Ajax: http://www.danga.com/openid/demo/demo.html
and detailed system specifications: http://www.danga.com/openid/specs.bml
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