I was recently checking out Stack Overflow, a relatively new programming Q&A site. Like PerlMonks, it uses voting to rate quality answers, but unlike PerlMonks, there aren't really discussion threads (answers with high votes get sorted to the top.)
Anywho, it looks pretty interesting, so I decided to sign up. Turns out they use OpenID, which I hadn't heard of before. OpenID can (apparently) authenticate you against any user database ("provider?") that has an OpenID API. So, if I'm going to answer Perl questions on Stack Overflow, why not identify myself with my PerlMonks account?
Would it be difficult to add an OpenID provider to PM? A good idea? I would of course be willing to contribute to the development effort. I'm already perusing through the OpenID modules on CPAN.