Best openid implementation

Question

I think OpenId has many things for it. But the biggest beef I have with it, is usability. Especially the technically non-savvy have dificulty understanding that the need to select a "provider" to login. Stackoverflows login implementation is quite good, but I think it would cost me quite some explaining to get my mother to use here gmail account to register/login to another site...

So the question is: Does anynone know OpenId register/login implemtantions which are more usable than Stackoverflows?

Answer 1

RPXNow is a paid service (with a free level) that has a nice UI. Then there's this one which is free and open source, but not as polished. But it did pass the "my mom could log in without help" test.