Most of you have probably heard about this by now. But you can win an Xbox 360 before the release date. Every 10 minutes Moutain Dew/Yahoo/Microsoft/Pepsi are giving away a Xbox360. All you have to do is buy a Mountain Dew (any flavor), Pepsi, 20oz bottles, and take the orange cap and enter the 10 digit code on http://every10minutes.com/
So far I've entered 8 and random times and haven't had any luck. Let me know if you've tried this.
Also if you have been entering them, here is a tip. When entering them, enter them at either 10 after, 20 after or 40 after of an hour, because that is usually when the least amount of people enter for a 1 hour segment.