Using Movable Type as an OpenID server

Tonight I ran across this plugin that enables Movable Type to act as an OpenID server. I had been using phpMyID as recommended by Sam Ruby, but I never liked having a login process with separate credentials just for my OpenID. With this plugin installed, whenever I log into a web site with my OpenID, I get redirected back to my MT installation to log into it. I reuse the MT login system and credentials, and that little bit of PHP code is gone from my site. One less thing to have to track, upgrade and potentially report bugs on.