Very nice. I don't use a numpad, so could you consider making the numpad pocket large enough to fit a decent size paperback? Maybe something in the One Hundred Years of Solitude or Wind-up Bird Chronicle range.
I'm a literature student, so a bag I can carry my keyboard and my book in would be perfect. Numpad pocket looks a bit small as is.
Just a thought, kind of a random thing. I always have like 3-4 books on me at any point in the school year, so it's nice to be able to keep them out of my backpack, since it's very small.