Microsoft has released Windows 7 and Server 2008 R2 Service Pack 1 RTM to public which can be downloaded using following link:
You can also use direct download link:

Let us tell you again that SP1 is a joint release for both Windows Server 2008 R2 and Windows 7.
SP1 doesn't contain any new features that are specific to Windows 7 itself. For Windows 7, SP1 is simply a combination of updates already available through Windows Update and additional hotfixes based on feedback by customers and partners.
From the server side, two key new features have been included:
Dynamic memory is an enhancement to Hyper-V in R2 and allows IT administrators to pool all the memory available on a physical host and dynamically distribute it to virtual machines running on that host as necessary. That means based on changes in workload, your VMs will be able to receive new memory allocations without a service interruption.
RemoteFX is the latest addition to Microsoft’s desktop virtualization stack. Using this new feature in Windows Server 2008 R2, you’ll be able to deliver an even richer and more user-transparent desktop virtualization experience. RemoteFX functions independently of any graphics stack and supports any screen content, including rich content like Silverlight or Flash. It also enhances the end-user’s hardware experience with support for USB redirection. Because it uses virtualized graphics resources, RemoteFX works on a wide array of target devices, which means you can deploy it over both thick and thin client hosts and a wide variety of network configurations.
This article was posted by VG in following section: Windows 7.
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Mark Anthony
conclusion , is this important or optional ?
VG
^^ You should definitely download and install it.
die77
Is it going to be delivered through normal windows update?
Uewd
Thanks for the news.
schemer
Will the SP1 be streamlined/merged into the Windows 7 images for direct installation during new system deployment?
Vroon
Finally wait is over.....
Downloading now.
Sankaranand
@schemer.. you can streamline yourself or wait for couple of days..some one would come up...
Uewd
Do I have to disable my antivirus program before installing Windows 7 SP1?
Ashish
Downloaded Slipstreamed .iso of Windows 7 Ultimate..
Someone posted on a forum that one of the USB drivers was not being updated with 7601 build by using "Windows 6.1-KB976932-X86" update stub,leading to USB being downgraded legacy 1.1 from 2.
juman
is it important.(you metioned it is just a combination of updates through windows update