Windows 7 was made available to MSDN and Technet subscribers today. I currently only have access to the Windows 7 Ultimate RC, so perhaps the MSDNAA isn't included. Customers with volume licensing agreements with Software Assurance will get access tomorrow. Those without Software Assurance will have to wait until September 1, with Gold and Certified partners gaining access August 16. Microsoft has tried to involve hardware and software partners along the development as much as possible, hopefully leading to greater adoption, compatibility, and functionality. Current predictions estimate that 177 million copies of Windows 7 will ship by the end of next year.