Starbucks has teamed up with T-Mobile to provide wireless access in a number of it's shops. Looking at their coverage in my area shows that the one down the street from me and the ones in Harvard Square have access. T-Mobile actually looks like it has some pretty good service offerings. If I were a student near one of those places I'd definitely look into it. Of course there are other places to sit near some of those hotspots.
Of course, I'm not a fan of Starbucks. Why can't the cafes I like have wireless access.