I'm fairly interested in cognitive science in general, but this was the first time I'd heard of any sort of scientific study of venting your anger.

When I get angry at my computer (which is the only thing I usually get angry at :) I often tend to hit whatever big solid object is nearby. However recently I've tried to switch to going to the gym. It might be even better to just lay down and relax for a while, but I find it a good excuse to get some exercise, and I take a nice relaxing shower after I'm done.