my university has a this "microsoft ambassador" person that hooks my club up with free pizza and shit sometimes. he says that MS is working on a program called "Academic Alliance". students will get vista and office for free(?) if you are in a certain major (computer science, computer engineering, electrical engineering, mechanical engineering). they are trying to open the program to as many majors as possible. It is expected to be released next semester.
i have no idea how much (if any) applies to your school. but that's what i've heard about in my school.