Windows Vista SP2 & Windows Server 2008 SP2
Microsoft have released the stand alone files for Windows Vista SP2 and Windows Server 2008 SP2 to the Microsoft website.
x32 Download http://www.microsoft.com/downloads/details.aspx?FamilyID=a4dd31d5-f907-4406-9012-a5c3199ea2b3&DisplayLang=en
x64 Download http://www.microsoft.com/downloads/details.aspx?FamilyID=656c9d4a-55ec-4972-a0d7-b1a6fedf51a7&DisplayLang=en
An advisory for those running Vista customized using vLite has been posted here http://technet.microsoft.com/en-us/windows/dd300591.aspx
We'd expect a release to Microsoft Update in the coming months and will blog about its release nearer the time.