But not much.
Microsoft has just revealed a new strand of it's Xbox Live Rewards program, called MyAchievements. The system basically gives you rewards based on your current Gamerscore. Don't get too excited, though - the rewards aren't that much, and you do have to be an Xbox Live Gold member to get them at all.
Rewards are divided into three tiers. The lowest tier - between 3000 - 9999 Gamerscore - gets you a special gift on your birthday, thoguh the small print says this carries a approximate value of £0.15. So we're guessing it's an avatar t-shirt or something equally exciting.
The rewards do get better, though. At 10,000 - 24,999 you get that special birthday gift (hooray!) as well as a 1% rebate on all Xbox Marketplace Purchases every month.
And the top tier, 25,000+, gets you the birthday gift and a 2% rebate.
So, nothing earth-shatteringly exciting, but you can't argue with getting something for nothing. To sign up, you need to register on the MyAchievements site here.