The new Macbook Airs are released, along with Mac OS X Lion.  If you don't already have one, my recommendation stands--it was and is a brilliant machine.  But for upgrades--and I was ready to pull the trigger on a new one--FAIL.   The machine needs 8GB of RAM.  I burned goats, stared at the night sky, fed the hungry, but the new Air still tops out at 4GB. 
Sorry, it's not enough.  My road warrior machine needs to run a bunch of OS's under virtualization, sometimes at the same time.  The lack of an 8GB option is a fail.  Maybe next time.  And since I have to wait, I also need a 512GB SSD.  Thanks.