Good news for TechNet Plus subscribers chomping at the bits to get SP1, Windows Vista SP1 Update is available for download through the top downloads section at http://technet.microsoft.com/subscriptions.

What's available?
Windows Vista Service Pack 1 (x86, x64) - DVD (English, French, German, Japanese, Spanish)Windows Vista Service Pack 1 (x86) - EXE (English, French, German, Japanese, Spanish)
Windows Vista Service Pack 1 (x64) - EXE (English, French, German, Japanese, Spanish)

The full install will be available towards the end of the month, Ill let you know when this is live.