Automattic’s WordPress.com hosted model of WordPress, announced today the release of WordPress.com Connect. A product offering very similar to Facebook Connect.
For WordPress.com users
Using the same log-in credentials you use for WordPress.com, you’ll now be able to sign in to third party sites that integrate with WordPress.com Connect. From your WordPress.com dashboard, you can easily control which apps have access to your data and remove access to those you no longer use.
By integrating with WordPress.com Connect, you can make it safe and secure for millions of WordPress.com users to “connect” their WordPress.com accounts and profile information to your website.
Not unexpected for WordPress.com to do this, almost a natural segue to furthering the WordPress.com community.
You can read more in the developer docs.