1. Well, just walking through the site for the first time, I couldn't get a profile, and thus I couldn't access "My Orders." Logically, that meant that I couldn't use the "Become a Seller" page. After I submitted some numbers, I got a very ugly error that said that I didn't have an account.
Exception Type: AttributeError
Exception Value: 'AnonymousUser' object has no attribute 'get_profile'
2. Entering my email into the "Login with OpenID" does nothing. No errors were returned.
1. That's a known bug.
2. That's not how OpenID works.