I'm so glad you posted this, I thought it was only me! But the Theme site is empty! Totally confused me too as this is my first day using SilverStripe and thought I was doing something wrong. So when will this be restored, anyone know?
The themes are working for me now: 12.32am NZ 08/06/08
The themes section was down for a few hours while we upgraded it. So now you can actually submit and edit themes again! Sorry Guys but all should be good now!