I'm all in favor of free stuff, and here's a great chance to get a great game for free. GameFly has been provided with a limited number of free copies of the 5-year-old game that was a smash hit in its time. It's still a great game, and for the price, you can't complain. It's a great time to try the game out if you haven't yet.
Head on over to GameFly and pick up the game for free, while the supplies last. According to a GameFly rep, the company only has a "limited quantity of free downloads from the publisher." In other words, get it now while you can!