Got a DVD player?
Check out NetFlix. It's an interesting twist on renting movies; you sign up for $19.95/mo, and create a “queue” of movies you want to see. They ship you three of them, and you can keep them as long as you wish. When you return one, they pull the next movie from your list and send it to you. No postage (it's all pre-paid mailers). If you can manage to watch more than 5 movies a month, it's cheaper than renting at BlockBuster, plus they've got a fantastic system for making recommendations; the more movies you rate, the better the recommendations are.