Mac Managers rejoice! Apple has updated both the Client and Admin packages of Apple Remote Desktop (ARD) to version 3.1. The update is said to address "numerous issues related to overall reliability, usability and compatibility." Specifically there's now support for the new Intel-based Xserve Lights Out Management feature and other improvements noted in the areas of software distribution, asset management, remote control, remote assistance and automation. The complete change log can be viewed on Apple's site.
If you are updating from ARD 3.0 you can download the Client update here and the Admin Update here. Both require Mac OS X 10.3.9 or later and are Universal Binary.