Last week, we learned that Vista’s SP1 should be available this week, and lo and behold, it is! You can grab the download here, as a 434.5MB download. It’s noted on that page that SP1 is also available through Windows Update, so it would be smart to check there first, as the download would be far smaller.
For our most recent testing, we’ve been using Vista Ultimate as our primary OS, but will begin using an SP1-equipped version now that it’s public. Assuming no problems arise, of course. You can read all of what’s new in the service pack here, but beware… it’s a huge read.
Windows Vista Service Pack 1 (SP1) is an update to Windows Vista that addresses feedback from our customers. In addition to previously released updates, SP1 will contain changes focused on addressing specific reliability, performance, and compatibility issues; supporting new types of hardware; and adding support for several emerging standards. SP1 also will continue to make it easier for IT administrators to deploy and manage Windows Vista.
Source: Vista Service Pack 1 Download Page