Windows 32bit Family XP RTM - 5.1.2600
XP SP1a - 1106
XP SP2 - 2180
Server 2003 RTM - 5.2.3790
Server 2003 SP1 - 1830
Server 2003 SP2 - 3959
Vista RTM - 6000.16386
Server 2008 Beta 3 - 6001.16510
Windows 64bit Family XP 64bit RTM - 5.2.3790.1830
XP 64bit SP2 - 3959
Server 2003 64bit RTM - 5.2.3790.1830
Server 2003 64bit SP2 - 3959
Vista 64bit RTM - 6000.16386
Server 2008 64bit Beta 3 - 6001.16510
Some very quick info that we came across regarding the latest release of Vista SP1 to testers. As Mary Jo Foley previously reported, Microsoft have indeed made the latest build of Vista SP1 (6001.16633) available as a standalone update file to testers.
Surprisingly, the update file is in the .exe format. Many (including myself) were expecting Microsoft to deliver the update for Vista SP1 in the the new Vista/Server 2008-only .msu format used for current Hotfixes.
Update: See here for our integration guide for 6001.16633.