Cats or Dogs turned out to be a great success. It was fun writing and I got a lot of great feedback.
I always meant to go back and add more polish and a bunch more features.
I'm finally starting to do that (reusing some of Potter Predictions too) and, rather than continuing to live off quisition.com, decided to get a dedicated domain: cats-or-dogs.com
Only thing there at the moment is the ability to subscribe to get an email when the site launches. I'll add an Atom feed too, for people who would prefer that means of notification. Both will also help me to gauge interest.