http://windowsteamblog.com: Today we officially handed off the final release (RTM) of Windows 7 and Windows Server 2008 R2 Service Pack 1 (SP1) to our OEM partners. On February 16th Windows 7 and Windows Server 2008 R2 SP1 will be available for MSDN and TechNet Subscribers as well as Volume License customers. On February 22nd, Windows 7 and Windows Server 2008 R2 SP1 will become generally available for folks to download via the Microsoft Download Center and available on Windows Update.
For Windows 7, SP1 will help keep your PCs well supported by delivering ongoing updates, many of which have been made previously available through Windows Update. It also includes client-side support for RemoteFX and Dynamic Memory which are two new virtualization features enabled in Windows Server 2008 R2 SP1. Read more about those updates here from the Windows Server Team.