Careful with the wording. WordPress isn't fully supporting OpenID, and this can be dangerous. They're acting as an identity provider without also acting as a

Careful with the wording. WordPress isn't fully supporting OpenID, and this can be dangerous. They're acting as an identity provider without also acting as a service provider. It's true that WordPress users can use their blogs as OpenIDs to login elsewhere, but users who already have OpenIDs can't use them at WordPress. Unless service providers implement the entire spec and treat all OpenID users as first-class citizens, regardless of identity provider, then there's really no interoperability here. What's the point of an OpenID if you can't use it at other "OpenID-enabled" sites like WordPress?