<http://y.20q.net:8095/btest>

Gino says:

I gave this as an exercise to my CS119.2 class. Too bad I couldn’t stretch it too much because it’s not really course-related, but I put it as a “CS exercise which CS students ought to think about.” :)

Had a lot of fun with this — unfortunately, the guys behind it don’t want to show their implementation to the world (yet?). :)