XP Embedded SP2 Tech preview is available for download from the following site:

http://download.microsoft.com/download/D/5/5/D55A381F-F2B7-4787-8A43-0D79CF8B8C35/XPEFFI.exe

For more information on what is new in XP Embedded SP2, check out the following article:

http://www.windowsfordevices.com/news/NS9761865541.html