As expected, Microsoft have made the beta of the 1st Service Pack for Windows 7 & Server 2008 R2 available after the kick off of the Worldwide Partner Conference.
You can grab the download here:
although it does say:
“This early release of Windows 7 and Windows Server 2008 R2 SP1 Beta is not available for home users. The SP1 Beta does not provide new end-user features, and installation is not supported by Microsoft.”
It’s currently available in English, French, German, Spanish & Japanese.