I was going to visit http://altdotnet.org today. After reading the introduction, very excited I was trying to log in using my blogspot openid.
Surprise "You must use an OpenID persona that specifies a valid email address."
My mind was WTF!!! of course. I've used this in an ever growing number of websites without having problems.
I've seen that I had problems using it on Scott Hanselman's blog also. I'm curios what the reason could be. :(