The new Service pack 2 both for Vista and Windows Server 2008 has been officially announced as the first of its kind, incorporating the 2 service packs for both operating systems into the one update.
Although still in it's Beta stages it has been said to optimise the performance of many Vista machines and improve the Hardware support throughout.
You can download it here.
For the Techies like myself who like to click-away without reading the Install docs, I will just bring this one to your attention:
"Service Pack Information
SP2 Beta is pre-release code which will change before the final release of SP2
Windows Server 2008 SP2/Windows Vista SP2 Beta is time-limited software that will operate until May 1st, 2010 - Un-install Windows Server 2008 SP2/Windows Vista SP2 Beta before May 1st, 2010
After SP2 installation your desktop may display the text "Evaluation Copy". This does not mean that your system is no longer "Genuine", only that you have installed a test version of software which is time-limited
After installing the service pack, the "Evaluation Copy" text may show up on the 2nd boot
After un-installing the services pack, the "Evaluation Copy" text may remain during the first boot, but will disappear after the next reboot
Starting any Windows Server 2008 SP2 or Windows Vista SP2 installations will result in Microsoft collecting information about the installation process."