MySpace will announce support for the OpenID single sign-on framework sometime this week, we’ve heard from multiple sources. This will be the second largest implementation ever and will bring the total number of OpenID-enabled accounts to over half a billion. MySpace’s 200 million user IDs join Yahoo’s 250 million or so accounts, plus accounts from a number of other large providers.
This is pretty big, assuming it’s true. MySpace will initially only become an OpenID Provider the article says, but not a consumer of OpenID. So you will be able to use your MySpace login to access other sites which support OpenID, but not use your OpenID to create or login to a myspace account.