In the past I looked at the OpenID standard in relation to Cardspace and AOL. Now Microsoft has committed to making Windows Live ID (previously known as Microsoft Passport) support the OpenID initiative.

"Beginning today, Windows Live ID is publicly committing to support the OpenID digital identity framework with the announcement of the public availability of a Community Technology Preview (CTP) of the Windows Live ID OpenID Provider."

The Live Services page does not mention Cardspace in relation to OpenID, but it stands to reason that as an OpenID provider Microsoft will somehow offer Cardspace support as well, just like www.myopenid.com.