This afternoon Microsoft has announced that XP SP3 has RTM’d (released to manufacturing). Although initially limited in deployment (to OEM manufactures and other private channels), make plans quick as it is scheduled to be available through WU, MU, and WSUS on April 29’th (8 days from now).
For a downloadable 11 page overview of XP SP3: http://www.microsoft.com/downloads/details.aspx?FamilyID=68C48DAD-BC34-40BE-8D85-6BB4F56F5110&displaylang=en
At first glance it appears that nothing very earth shattering in there as it pertains to SBS. The link in it to details of patches rolled-up into SP3, KB936929 – http://support.microsoft.com/kb/936929, is not resolving at the moment. Likely it is offline temporarily while the RC2 information is replaced.
! ***Important Release Delay Update – link below***