Windows Vista SP1 released to manufacturers
Microsoft is also beginning to manufacture Windows Vista installation DVDs with Windows Vista SP1, which means you'll be able to pick up a licensed copy of the software at stores within the next few months as well. In mid-March, Microsoft will make SP1 available as an optional download through the Windows Update service. In mid-April, Windows users who are signed up for automatic updates will start to receive it.
The company has identified some device drivers that are still incompatible with SP1, and promises not to push out the update to computers running those drivers. Overall, Windows Vista SP1 is designed to improve compatibility with hardware and software, and improve system reliability. Users shouldn't expect a huge performance boost, but if you've been having problems running Vista properly on your system, SP1 may be able to help.