Interesting little story on Slashdot today about a Tron game made in just 221 bytes - http://alokmenghrajani.github.com/tron/ - does seem very small but then you have to remember that Javascript and Chrome do provide a large amount of the handling code, pretty much all that had to be implemented was a tick function and a draw function with the direction being represented by an on key up event.
Might have to attempt it in something like python or C++ for extra brutality.
Key Up event, key press was to many bytes.