This year you can compete in the (replay of the) MIT's Individual round on Z-Training. (http://www.z-training.net/competitions.php)
The competition will take place on October 4th, 2009 (http://web.mit.edu/acmicpc/www/2009/index.html), and the replay of the competition (open to everyone) will take place a week after that on z-training.net.
-Aleks