Thanks to the joy of a nearby Apple Store I've touched the 11". I am infected now. I verified that my 51 yo eyes can read the screen -- that was my main concern. I've also confirmed that it's no bigger than an iPad.
My decision would be easier if the Air had shipped with USB 3. That would more than compensate for the lack of Firewire or ethernet ports.
So why doesn't the lovely 11" come with USB 3? Will there be a USB 3 version out this fall?
This Wikipedia article explains ...
This looks ominous. I'd be surprised to see USB 3 in an Apple product before mid-2011. I wouldn't be surprised if they took another path entirely.
... Intel will not support USB 3.0 until 2011 ... These delays may be due to problems in the CMOS manufacturing process ... .... or a tactic by Intel to boost its upcoming Light Peak interface... Current AMD roadmaps indicate that the new southbridges released in the beginning of 2010 will not support USB 3.0...
Bottom line: USB 3 isn't ready now, isn't likely to be ready for a year, and may yet go the way of Bluetooth (basically dead).
PS. Incidentally, I tested in the Apple store. The MacBook's USB port has enough juice to charge an iPad.