Windows 7 SP1 download due today, says Microsoft Technet post
A Microsoft Technet blog -- albeit a Russian one we've had to run through translation sites -- indicates that "pack will be publicly available tomorrow." The post discusses virtualization improvements in Windows 7 SP1 and Server 2008 R2 SP1 and was published January 13, 2011. If the author's statement is accurate, that would definitely make today SP1 release day.
Update: According to Tom Warren at WinRumors, the public download isn't coming today. Rather, the original post was announcing the availability of the Windows 7 SP1 RTM to OEMs today.