I switched from the MBA (1.6/80HD, bough on 2nd week it came out or so) to the new Macbook (2.0) a few days ago.
I'll probably try selling my old MBA on Craigslist. It's in so-so condition (has a few minor scratches, and 8+ months of heavy use). Nothing is broken or disfunctional, except I have had heat issues when I tried to play World of Warcraft on it (which I ended up not playing too much on it due to speed issues).
Basically I wanted to switch to something that could play WoW very nicely, and multi-task Parallels(Vista) for some specialized software unfortunately I have to use occasionally which doesn't run on Mac.
I was really tempted to grab the MBA Rev B, but was thinking really even with the new graphics chip, I didn't want to take any chances on it if there were still heat issues on it. Maybe Rev C + once SSD prices come down further that might be another story.
I don't know what to price my MBA at, (I'll sell my external superdrive + a 2nd magsafe connector with it too), right now I'm thinking $950.
I really love the new MB, so far it works extremely well, and I'm having fun with it. I'm curious to see MBA Rev B's graphics + heat performance though.