Thanks to OpenID and OAuth, the Open Social Web is Beginning to Emerge
blog.wired.com
blog.wired.com
I'm not keen on OpenID though. At the moment if someone grabbed my facebook password I'd be understandably annoyed. But if someone grabbed my OpenID password, and I used that for lots of sites, I'd be devastated.
Most sites will send auth details by email if you forget your password; having your email password taken is just as much a risk as having your OpenID password taken.