I agree with Blowdart. The problem is we don't need more openid providers, we need more openid consumers. Channel9, MSDN forums, hotmail, Facebook, and Google should all consume open ids.
The problem is that then we store some of our profile informaiton elsewhere and they would lose out on that.
www.identi.ca the open source twitter clone is a consumer of openid, so I use my open id from Ubuntu (launchpad.net is a provider and their wiki's are conumser's) to authenticate against identi.ca and all of the Ubuntu sites.
Now if i could just standarize against one open id provider (whether Yahoo, MS, or someone else) and sign in across the board then I would be excited.
"I agree with Blowdart. The problem is we don't need more openid providers, we need more openid consumers. "
True. But more providers will hopefully push the adoption those considering whether or not to make their apps consumers.