As you may or may not know, retailers can no longer sell computers with Windows XP preinstalled. Microsoft designated June 30, 2008 as the end-of-life for Windows XP. However, if you absolutely have to have Windows XP on your next computer there is another option. Through the end of December 2008 you can take advantage of Windows Vista Downgrade Rights.
With Downgrade Rights, customers can purchase select versions of the Windows Vista operating system, including Windows Vista Business and Windows Vista Ultimate, but have Windows XP Professional installed instead. Businesses that choose this option will receive a backup disc for Windows XP Professional and an installation disc for Windows Vista. Plus, as long as the vendor has installed the operating system, you'll be able to receive technical support for the duration of the system's Limited Warranty.