I do agree with pretty much all above stated. I am a teaching assistant (or graduate student instructor, as we are called in our alma mater) and I have been trying to use my Tablet PC to make my life easier. By no means I am trying to convert you back to the Windows "Sect," but a Tablet PC with PDF Annotator is probably the best option for grading and commenting; I would also strongly recommend that your Tablet PC uses Wacom digitizer (i.e. those which use a special pen, not anything), because passive touch screen for this purpose is nothing but pain in the neck - input is never smooth, plus you will have a lot of vectoring - crazy doodling that happen when two different objects touch the screen almost simultaneously. iRex readers use Wacom digitizers, but they have choppy input because of slow refresh rate of e-ink display; which will become annoying very quickly.
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