You can create your gamertag early so when the 360 comes in someone else doesnt beat you to it!
When you sign up for My Xbox, you get access to your Friends List, your account information, your game achievements, the xbox forums, and your gamer card.
- Create your online identity.
- See your Xbox Live Friends List.
- Manage your Xbox Live account.
- Send and receive private messages.
- See and compare your Xbox 360 achievements.
- Track how many games you’ve played.
You can get to the site by clicking [here].
Thanks to Dot Merix for the info!