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as of today, WordPress.com (the hosted blog-service, not to be confused with the self-installed offering on WordPress.org) is supporting OpenID in both one direction. for now this means that users may login using existing OpenID-credentials as well as use their WordPress-URL as identity token for logging into other services (check the OpenID Directory for an extensive list) of OpenID-supporters). using existing OpenID-credentials on WordPress.com isn’t supporeted yet, but will most likely follow soon. OpenID really is taking off since the beginning of 2007, with major sites like Digg and Netvibes joining the party. seems like a good idea to check out the existing OpenID-implementations which are begging to be integrated with your next web-app …

OpenID is generating a reasonable amount of buzz recently. OpenID is a vendor-independent approach on bringing the infamous concept of single sign-on to the web. in a nutshell, OpenID allows users to use a single, URI-based token to access numerous OpenID-enabled websites. this post on Read/WriteWeb features a screencast explaining the concept and a comparison with the single sign-on efforts by Yahoo, Google & Microsoft.