A short time ago, Microsoft released Service Pack 2 for Vista and Windows Server 2008.
Available from the Microsoft Download Center, the new SP2 's are available as stand-alones and/or a burnable ISO for DVD.
"The latest service pack for both Windows Server 2008 and Windows Vista, supports new types of hardware and emerging hardware standards, includes all of the updates that have been delivered since SP1, and simplifies deployment, for consumers, developers, and IT professionals".
Sidenote for the Beta crowd: Microsoft has also recently released Visual Studio 2010 and .Net Framework 4 Beta 1, as well as Silverlight 3.0 Beta for developers. These betas, at least for me under Windows 7 RC, have been running without issues so far and are worth checking out on a non-mission critical PC for forward looking developers.
Great week all