I just upgraded to the 3.0 version of the OpenID plugin, and the old functionality appears to be working.
I attempted to leave a Blogger comment using the built-in provider, though, and it's not working. Entering http://www.nostate.com/ for my OpenID URL, I get redirected to http://www.nostate.com/wordpress/?openid_server=1... (plus a bunch more options). If I remove "wordpress/" from the URL, I see an invitation from the plugin to log on to validate.
My site is set up such that http://www.nostate.com is answered by WordPress, but wordpress itself lives in ~/wordpress rather than just ~.
Any solution out there, or is this a bug?