I've setup a goal conversion of sorts, but the issue that I have is there isn't a "real" registration page. Sometimes /register/register/ works, but other times /login/login/ works. It really depends on the path the user takes to the registration form. If there was just one static page that I knew every user trying to register would be sent, it'd be much easier to track the conversion rate.
My general feel from the data I'm analyzing is that users really get confused by the slide-in form for registration.