I have both a Macbook Air 2.13GHZ (new version) and a new 13" 2.7GHZ i7.
I'm posting here (again

) because i've been using them both a bit now. I've decided that if you need power at all, get the new MBP. These new i7's are at least twice as powerful . Now when I say twice as powerful I mean it, unlike comments you hear all the time about products. As a matter of fact it's probably more like 3 times more powerful. Actually 3 times! . In other words, a demanding app that has a built in cpu meter will register perhaps 15% on the Air while only registering 5% on the MBP.
And these are both 13" machines that cost about the same. The MBP weighs more, and has a lower res screen (which is a drag ,even though it's a good screen), but the difference in power is extreme. I would MUCH rather travel with the Air but it's just not going to do it for me after using the new MBP.
Now what's going to happen obviously, is that the Airs will be refreshed in a couple months to the i3's or 5's and then they will have a leg to stand on. Right now they a just limping along.
Just a heads up.