The announcement here.
When I first heard this I expected I'd be able to log-into my Technorati account with an OpenID but it seems not - they are using OpenID for the use case (as I understand it) for which it was originally designed, i.e. to allow a user to lay claim to some URL.
Blogger doesn't support OpenID so I wasn't able to test the mechanism but it worked for David Recordon.
Unrelated, www.openid.com =/= openid.net (unless OpenID is expanding into insect identity use cases?)