Microsoft has released the first service pack for it’s latest Windows OS, Windows 7. Users of Windows 7 should begin to see Service Pack for Microsoft Windows (KB976932) being offered in their Windows Update control panel. You can also download the installer from the Microsoft Download Center.
http://windows.microsoft.com/en-US/windows7/learn-how-to-install-windows-7-service-pack-1-sp1
There are no major new features coming with SP1. However, there are the following minor changes:
An updated version of Remote Desktop Services. This is required for a change that is coming in Server 2008 R2 with SP1 (RemoteFX).
Better support for third-party federation services. With this update, Windows 7 now supports services that utilize the WS-Federation passive profile protocol.
Improved HDMI audio device performance. SP1 fixes a bug in Windows 7 where a small percentage of users experienced a disruption of audio over HDMI after a reboot.
Minor XPS document fixes. For the rare case where an XPS document contains both portrait and landscape pages, SP1 fixes a bug that prevented correctly-formatted printing.
Hot-fixes and other bug fixes. Like any service pack, SP1 also contains an aggregation of previously released and new hot-fixes and other bug fixes.