OpenID finally got its flagship account customer in Yahoo. This has been a long time coming and I'm glad a major player has jumped on the OpenID movement.
This is also a smart move by Yahoo. To date this has been a classic chicken-egg scenario. By moving first, Yahoo can cement its logins as the de facto standard for a "universal login" (universal login is how I think users/customers will view OpenID). It creates brand share of mind for Yahoo. I know I will start using my Yahoo account.
Side note... if OpenID was named "UniversalLogin" instead, I bet we would have seen more movement in this space than . OpenID doesn't resonate with the layperson; UniversalLogin does.