Microsoft have made available a document outlining the various changes made to Windows Vista in Service Pack 1 on Microsoft Downloads. The 1.4 MB file is available both in xps and pdf format and also includes details on Windows Vista alignment to the recently released Windows Server 2008.
This document provides more detail about the notable changes made to Windows Vista in Service Pack 1, which were focused on addressing specific reliability, performance, and compatibility issues, supporting new types of hardware, and adding support for several emerging standards.