Yes you heard correctly - The long anticipated release of Windows Vista SP1 is here. Currently you can download it from the Microsoft Download Center and it will be pushed via Windows Update in April.
Things to know before you download Windows Vista SP1...http://technet.microsoft.com/en-us/windowsvista/bb968859.aspx
935791: How to obtain the latest Windows Vista service pack:http://support.microsoft.com/kb/935791
Here are some links to general information on the improvements in Vista SP1.
Overview of Windows Vista Service Pack 1http://www.microsoft.com/downloads/details.aspx?FamilyId=39B802EA-B2CF-4585-8CEA-2CC6A6247CB3&displaylang=enThis white paper presents an overview of Windows Vista SP1 and the improvements it contains.
Notable Changes in Windows Vista Service Pack 1http://www.microsoft.com/downloads/details.aspx?FamilyID=d69c4e1b-c81a-41be-b1f5-66e615ba5912&DisplayLang=enThis 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.
Release Notes for Windows Vista Service Pack 1http://www.microsoft.com/downloads/details.aspx?FamilyID=b5b681f5-f366-4ad2-ba10-6a7d209de7bd&DisplayLang=enRelease documentation that contains known issues for Windows Vista Service Pack 1 (SP1).
Hotfixes and security updates included in Windows Vista Service Pack 1This document contains a list of all the hotfixes and security updates included in Windows Vista SP1.
Windows Vista SP1 Guides for IT Professionalshttp://technet2.microsoft.com/WindowsVista/en/library/90a564b9-34af-4a6b-937f-324e1862244b1033.mspxThese guides will assist IT Professionals in evaluating and deploying Windows Vista SP1 and are downloadable versions of the SP1 guides found in the Windows Vista Technical Library.
Windows Vista SP1 Frequently Asked Questionshttp://technet.microsoft.com/en-us/windowsvista/bb738089.aspx