I ordered a 13" with 2.13GHz, 256GB, and 4GB RAM. Pretty much exactly what I was hoping for. With the bigger storage and RAM, I can comfortably run Fusion and Windows 7 for a couple of things.
I'd have been tempted by the smaller one, but the processor speed scared me off. I have a couple-of-year-old Sony TX with a 1.3GHz (I think) processor, and I find it sluggish (even with Windows 7). I'm sure the little Air will be much better though. Apple wouldn't let such a slug out the door as Sony would.
I also ordered an iLife '11 Family Pack to update a few other MacBooks around the house. I still have a 13" MBP and a 15" MBP, and my wife has a 15". We also have Office 2011 on order! (My last MBA, a Rev A, is now in the hands of my nephew.)
So I have something to look forward to next week Apple-wise. The next great leap will be when iOS 4.2 hits for my iPad. It needs it badly.
Enjoy your new MBAs, all!