"To aid IT professionals in planning and testing for the deployment of Windows XP SP2, Microsoft is making available this preview, based on Release Candidate 1 (RC1) of the SP2. Additionally, we have established 11 newsgroups for sharing information."
http://communities.microsoft.com/new...xpsp2&slcid=us
Windows XP Service Pack 2 (SP2 RC1)
http://www.microsoft.com/technet/pro...p2preview.mspx