Hope they start sending 4GB RAM models to the Apple Retail Stores so that it's easier to buy them.
The only thing that disappointed me with these new models is that they didn't come standard with 4 GB of RAM.
You would have to think that these new Airs had Lion in mind when they were being designed. Can we assume that Lion will run well in the standard configuration with only 2 GB of RAM?
For future proofing, 4 GB of RAM seems like a better way to go, and it would be nice if you can just go into a store and pick one up.