4kb java racer! =Dhttp://www.mojang.com/j4k/
[the following was moved here from the j4k thread in general discussion:]
I'll release the source once it's "done". I'm running desperately low on space though, so I'm not sure how much more I can tweak this, so it might be "done" fairly soon.
The lack of frame decorations is an "intentional bug". It's supposed to go into fullscreen mode, but when it fails you're left with a frameless window stuck in the upper left corner.
I'll try tweaking it into something more gamelike, with better physics and perhaps not lawsuit-prone stolen graphics.
Oh, and it doesn't run at the same speed on all computers.. no space to add timing code. =/