Yes, all the 360 add-ons can be used anywhere. I e-mailed the Xbox support b/c I'm moving to Australia & wanted to know the same thing. Here's the reply...

Hello Valued Customer,

Thank you for contacting Microsoft online support for XBOX. I am Amie and I will be helping you today with this issue.

As I understand that you are inquiring if you can use your hard drive detached from your US console to an Australian console. I apologize for any inconvenience that you may have. I appreciate the opportunity to assist you.

Yes, you can attach your hard drive to an Australian console because Xbox console accessories do not have regional encoding or region-specific requirements. Thank you for your time and understanding.

If you need to reply to this e-mail, please reply 'with history' (include any previous e-mail) or reference to Service Request Number 1108725715 so we can expedite our service to you.

Thank you for visiting Xbox.com. If you should have future questions on Xbox products or services, please be sure to revisit our Web site as we are continually adding information to enhance our service.

Sincerely,

Amie

Microsoft XBOX Support Services

http://support.xbox.com/