After few month of beta testing, the Service Pack 1 for Windows 7 and Windows Server 2008 R2 is now RTM.
It has already been delivered to OEM for integration and if you are MSDN/TechNet subscribers, you can download it starting next Wednesday.
As part of enhancement, Windows Server 2008 R2 SP1 is providing dynamic memory configuration for Hyper V or Remote FX for remote desktop.
The Service Pack 1 will be available through Windows Update on February 22nd.