Microsoft has released Windows 7 SP1 download
and Windows Server 2008 R2 SP1 download
on MSDN Subscribers portal for MSDN Subscribers.
The Windows 7 SP1 release date
for public will be within a week.
You can check here or Microsoft Downloads portal for the next days for Windows 7 SP1 download available for public.
Microsoft chooses to share such new releass first with MSDN subscribers and customers taking support from Microsoft.
The Windows 7 SP1 release date is finally 22nd of February and the Windows users can download Windows 7 SP1 (and also Windows Server 2008 R2 Service Pack 1) from Microsoft Downloads
For more details about Windows 7 Service Pack 1 download and how to install Windows 7 SP1 using Windows Update please check the Free Windows 7 Service Pack 1 Download (Windows 7 SP1)
Please refer for what is included in Windows 7 SP1 and Windows Server 2008 R2 SP1 here