Firmware update to XBOX HD-DVD drive

A firmware update to the HD-DVD add-on drive for the XBOX 360 will be released today May 15th.

Here are the details:
Option for user to select from the following audio output formats via TOSLINK or HDMI:
- Digital Stereo (2 channel PCM)
- Dolby Digital 5.1
- DTS 5.1
- WMA Pro

- Option to enable/disable Night Mode
- Added "Dynamic Range Control" toggle for digital audio output
- Improved HD DVD networking support
- Improved HD DVD title compatibility
- Improved performance with MPEG-4 AVC / H.264
- 1080p via HDMI is supported on the Xbox 360 Elite with HDCP compliant displays Improved parental controls

Source: TeamXbox.com

You can get the update trough XBOX Live when you log on with the drive attached.

Learn more:
Read our review of the drive