This year will be my second time going to AirVenture, and the second time camping in Scholler. Last time was in 2005. So take my vast Oshkosh camping experience for what it's worth, but here are the lessons I learned from my first trip:
1.) Heed Gregg's advice about the tent stakes and tent cover. I neglected to adequately secure my tent cover when I set up my tent and, of course, it POURED the first evening. I got back to my tent after Theater in the Woods to find that it had pulled back enough to let a couple inches of rain into the tent. I did it "right" after that and didn't have to touch it the rest of the week.
2.) Lesson #1 was quickly remedied with the tent stakes and some rope I brought with me. I'd say it's a good idea to have a tool kit as well, but that's good road trip advice anyway.
3.) Lesson #1 wasn't as bad as it could be because I brought a cot with me to sleep on, so I was ~12 inches off the ground (and water) already. I think I'll be sticking with that idea in the future. Beats sleeping on the ground regardless.
4.) Store things in your car if you don't want them getting soaked, just in case. When you're exploring the warbird area and realize a summer storm is blowing in, there's not much you can do about your campsite a mile away.
5.) I hit the showers in the evening and had no trouble getting a stall. Mornings, I have no idea.
6.) Navigating to and from my camp site really wasn't that bad, though I staked out a site right down Schaick Ave which made it easy to find home. I was WAY down almost to Hwy 41 and walked it everyday, usually twice. It really wasn't that bad, but there were busses passing me frequently if I had wanted a ride.
7.) Go out exploring the camp at least one evening. One night I decided I wasn't ready for bed and went for a walk. I happened across the group visiting from South Africa. They throw one hell of a party! I'm sure it's not the only one... The people in the camp are great. That first night when I was out there tying my tent down, my neighbors invited me some shelter in case I needed it. I was always invited next door for their evening bonfires (though I tended to be running around until I was ready to drop).
8.) The camp stores are a great feature. I'd usually grab a bag of ice on my way back to camp in the late afternoon, as well as whatever perishables I wanted for dinner that night. Very handy, and much better than having to go off-site for groceries. I don't remember how the prices were, but I apparently figured the convenience was worth it since I was a frequent customer.
That's all the advice I have off the top of my head. Don't know if it's useful or not. I do know that I'm getting very eager for July to roll around though!