I've often said that the children are our future and it looks like Princeton students share my vision of the future. This year, reports the Daily Princetonian, 45% of all computers purchased by students were Macs. This is an all time high for Princeton (2003 saw 15% of students buying a Mac, and it has been on the rise ever since).
Some might say that college student probably just think that Macs are cool (which they are) and so they just want to look hip. This might have something to do with it, but Princeton's Office of Information Technology says that Mac usage amongst the faculty is also on the rise.
Allow me to add some anecdotal evidence: I work for a large university and I have been seeing a larger number of Macs on campus, and in my office.