Wednesday evening (16th February) saw the release to TechNet and MSDN, the RTM binaries for Service Pack 1. Next week (February 22nd) will see the general availabilty of Service Pack 1.
Information that is relevant to Service Pack 1 is documented below.
Hotfixes and Security Updates included in Windows 7 and Windows Server 2008 R2 Service Pack 1
(757 Hotfixes and 39 Security updates).
The Windows Automated Installation Kit (AIK) for Windows 7 SP1 (This is an incremental update to the WAIK).
Early KB Articles