This game has saved me from certain death from boredom at points in many classes. It's only moderately addictive and only about as involved as Fantasy Football, but I think it's a lot more fun because it's like an RPG. You create a player, train him, buy his equipment, and get him drafted by a player-controlled team. We formed a team from our law school, GWU, and we'd like to try to form a league amongst just law schools.
Here's the link, it's completely free:http://goallineblitz.com/game/signup.pl?ref=6677480