There is a new System Update available for your Xbox 360.
The official announcement says: “The March 2006 Xbox 360™ update will prepare your Xbox 360 console for future system and title updates.”
You will automatically receive this update the next time you sign-in to Xbox Live from your Xbox 360. If you don’t, try running the “Test Xbox Live Connection” from the Network Settings area of the System blade. You need an Xbox 360 storage device in order to successfully receive the update.
The System Update will also be distributed in upcoming game discs, magazine discs, and even through the retail kiosks.