(Not all that) Hot on the heels of Sony's Playstation reward program, comes the Xbox version. According to majornelson.com, the program will give you points for watching movies and sports as well as playing games "and more".
Not really sure what the "and more" means but earning MS points for just doing what you do sounds good. It's free to sign up (if you have a Gold level account) and you might be getting an email invite (we did) to take part, but if you don't: http://rewards.xbox.com/