Old service center
I would love to see the airport do something with the old Continental/United "service center" that's near the C7/C9 gate area. Putting the big guitar display there was a nice attempt at distraction, but it still looks lousy. A small shop, or even an art display nook would be nice.
Just for fun, I think they should put a piano in there, so I can play a little while I'm waiting for a flight. But seriously, I wish they would do SOMETHING with it.