Windows Server 2008 R2 and Windows 7 SP1 has shipped. Here’s the bottom line:
The Windows Server team has information on SP1 here: http://blogs.technet.com/b/windowsserver/archive/2011/02/09/windows-server-2008-r2-and-windows-7-sp1-releases-to-manufacturing-today.aspx
Technical information on the service pack can be found here: http://technet.microsoft.com/en-us/library/ff817622(WS.10).aspx
Feel free to use the comments as an informal place for questions/feedback if you like. I will have some followup information on the service pack a little later.