How are you using your iPads during class? I'm thinking of buying one since there are times when I want to show my students how to annotate a text or how to correct a particular grammar error, so being able to write directly on the document would come in handy. But would it be handy enough to spend $500+? We do have overhead projectors, which would cover many of my needs, but they're a pain to use since they're on the 1st floor, and I'm on the 3rd. Plus, transparencies need to be made in advance, which means no spontaneity.