The MacBook-iPad integration for external display use is really quite nice. I don't use it that much right now because I've got a nice extra wide screen monitor next to my laptop stand for when I'm at home and I'm always at home, but I used to, when I would be working at the library in the olden days and it was nice to have an extra screen from time to time.
Yea, there are many people just using their laptops as a monitor on stand next to their existing monitors. Then they just use whatever separate keyboard they like. So this would essentially remove the bottom part from laptop for extra screen estate.
I never thought of that and now I want it really bad. I kind of do this everyday, but with a macbook and manually.