I entered the 2010 Perth Game Jam again this year, but only had about 6 hours to put together an entry. Simon Wittber did a great job of organizing it again this year.
Simon has put up photos from Perth Game Jam, and ofcourse the Perth 2010 Game Jam games.
I put together a very simple multiplayer game for OSX, with the aim of making it into a 4k game. I managed to bring it in at around 3.5kb, but it was quite unstable.
You can download the game (Puggle) for Windows/OSX.
Below is a time-laps video of the event, I arrive at around 2:30..