On the Server side, 32- and 64-bit versions for standard processors are available, plus a version for Itanium-based systems as well.
There’s also a TechNet article available dated 5/26/09, entitled “Service Pack 2 for Windows Server 2008 and Windows Vista.” This is where most people will want to go to grab their downloads, because you can get separate versions here for ISO (the preceding item in the initial paragraph), but also separate links for x86, x64, and ia64 (Itanium) versions are also available. You’ll also find a link here to the Windows Service Pack Blocker Tool, and a FAQ that describes its recommended uses.
It will still be a while before Windows Update provides automatic access to Windows Vista SP2, so you may want to give the TechNet link above a visit in the meantime.]]>