Contrary to rumors going around the web regarding an alleged screencap of an internal Sharepoint site listing the Vista SP1 release date, it's going to be a while before the masses see SP1. Biplab Paul a Technical Consultant at Microsoft has made a post on his blog detailing the roll out of SP1.
When will SP1 be shipped?
Mile Stone 1 ( Feb 4, 2008 ): Available to OEM and Retail Channel
Mile Stone 2 ( Early March 2008 ): Vista SP1 Volume Licensing Availability
Mile Stone 3 ( Mid March 2008 ): Vista SP1 availability through Windows Update/MSDN/TechNet
Mile Stone 4 ( April 2008 ): Will be pushed via Automatic Update
http://blogs.technet.com/bpaulblog/a...ce-pack-1.aspx