After twenty years of Camp Scholler, I spent the past two AIrventures at the UW-Oshkosh dorms. There are many dorm buildings but only one air conditioned one. Reservations open on July 1 for the NEXT year's Airventure. It may already be too late to get an air conditioned room for 2010.
The two dorms I've stayed in have been about four stories tall and without elevators. They're 1960s vintage and clean but not particularly interesting buildings. There are friendly 24x7 main desk attendants in each dorm.
This year the men's room for my floor was just a few doors down the hall from my room. Last year, the men's room for my floor was on ANOTHER floor.
The non-airconditioned dorms have windows that you can open. Most dorm room renters bring or buy a window fan to use in case it's very hot.
There's free, off-street parking for cars. Not always real near your dorm, though. You may want to bring a rolling cart or roller bag. (Just remember the lack of elevators, once you get to the dorm.)
There's a shuttle bus that'll take you from the campus to WIttman Field and back. Or, as noted, it's an easy drive back and forth. Airventure parking lots open at 7 am.
The campus food service offers meals but only during peak meal hours.
There's some free wi-fi for dorm guests but not everywhere you might expect. For example, not in the student union building. And not in every room. I had good luck in a common lounge area in my dorm this year.
All in all, for $50/night, it's a good deal if your expectations are low and camping isn't your thing.
But camping by your car at Camp Scholler or (find a way to do it sometime, it's great!) camping by your plane on the North 40 is the real deal. You get a sense of non-stop involvement that staying off the field doesn't allow.