Microsoft has published the first service pack for Windows Vista on its website.
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. Windows Vista Service Pack 1 Five Language Standalone version can be installed on systems with any of the following language versions: English (US), French, German, Japanese, or Spanish (Traditional).
You can grab the 32-bit version here and the 64-bit version here. Both downloads feature the standalone Windows Vista SP1 installation and can be used with the English, French, German, Japanese and Spanish versions of Windows Vista.