I finished my first facebook game with player.io!
Ok, it's not that exciting, but I'm happy to have finally finished it. Getting folks to play it may prove to be much more difficult though.
The game is available here:
http://apps.facebook.com/azuana-bingo
It is built using Sitebox, QuickConnect, BigDB and the Multiplayer code as well.
Good luck to everyone, player.io is definitely a great system and I hope they have continued success.