More people are jumping on the OpenID bandwagon, the latest being MySpace:
BBC: MySpace signs up to OpenID scheme
Good, bad, or indifferent, OpenID is winning the mindspace battle. If something better comes along, it's going to be fighting an uphill battle!
Reading further on the topic, it seems that a bunch of the Big Providers are happy to PROVIDE OpenID to other, lesser systems -- but are not willing to honor the OpenID credentials from other sites. Which is pretty useless -- and defeats the whole purpose of OpenID.