WOW, awesome tip Russel. I just signed up for it using my .edu email address and instantly got access. I don't see anywhere to download Windows 7/8 though so I guess my school must not have premium...
Dreamspark (which does not include Windows 7/8) is available to all post secondary students.
Dreamspark Premium requires a subscription from your institution and is only available to students in Science, Technology, Engineering, and Math programs.