One of the few things you're likely to notice when you get there, is the amount of planes parked everywhere. It's pretty amazing.

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Then, you get through the main gate, and go look around at all the vendors and displays. If you're thorough, it can take 2-3 days (especially if you account for pretty much guaranteed times of bad weather where you'll be hiding in vendor tents).
Seeing the vendors in the big hangars was definitely useful, I learned about a nice Angle of Attack (or reserve lift) indicator which should be on all planes in my opinion, as well as saw the Vista Nav 3D synthetic vision device, and got to meet the nice folks from Seattle Avionics I had corresponded with many times.
I also learned in the process that Garmin were actually a bunch of bastards who managed to get near exclusive rights to all XM weather hardware, preventing innovation or competition among XM weather receivers for PC tablets, which is a damn shame considering that XM weather should be available to all due to the extra safety it brings to pilots. Anyway, I'm personally hoping for a combined PC tablet with solid state hard drive, a small XM weather receiver/GPS combo and vistanav + voyager on it. We're close, but not quite there yet.

The Xwind trainer is a great idea, I paid for a session and it was quite useful

What's also cool is some of the formation flights over the expo. Likely more planes than you'll have seen anywhere else.

There was so much to see and do. In 3.5 days, I only got to see a portion of it (and missed a few evening movies and talks due to being a bit too far and too tired to come back just for them). It was nice to be able to see and hear historic people like Chuck Yeager recounting his war stories and talking about how he broke the sound barrier.

Of course, a good portion of your day is likely to be taken by the airshow performances, some of which are quite good. Unfortunately, the F22 performance got cancelled two days in a row (the second day, due to a fatality during the air show unfortunately), so I never got to see them perform outside of their arrival from a distance. Seeing a couple of Harriers doing hovering up close was pretty ool though.

Outside of the main conference location, about a 15mn walk way, the air museum was nice to visit, and across from the museum, they were selling cheap 7mn heli rides above the whole place. Nice to get a bird's view if you were too busy flying the plane when you got in (as you should have been :) )

Before heading home, at the recommendation of Dave, my CFI, I got a real live briefing at a flight service station, probably something I won't get to do again in the future. It was nice to see one of the guys who picks up when you call WXBRIEF

I was a bit apprehensive about landing at Oshkosh, mostly due to some horror stories I heard about very long wait times to get out. I didn't quite figure it out, but on wednesday morning, I walked to the entrance instead of taking the bus (not very smart: 2.5miles/45mn), but I got to see a scary line of people waiting to get out:

Luckily, when we left on saturday morning around 09:00, they were sending planes out 2 at a time and we got out in less than 15mn.

I obviously have many many more pictures. You can following this link for the pictures of EAA/Oshkosh 2007 including the 10H flight from and to Oshkosh.
It was definitely worth attending and made for an interesting cross country flight.