Microsoft has released the spring Xbox 360 system update.
You'll be prompted to download it when you turn on your console, presuming you're connected to the internet. The download takes around 5 minutes on a fast connection.
The menu fonts have been smoothed slightly. The most noticeable addition is that of PayPal to the billing options.
The spring update is supposed to add behind-the-scenes support for Avatar Kinect and a new disc format.