Google has just announced priority invites for students.
So starting today, we’ll be giving priority Google Voice invites to students. To get an invite, just visit google.com/voice/students and enter an email address that that ends in .edu. So if you’re a student, submit your email address and a Google Voice invite will arrive in your inbox within 24 hours.
I have been using Google Voice for a couple years now and it is an invaluable service for those situations when you need to give a phone number to a stranger (think posting a resume or selling stuff online)