I finally found a 2.13Ghz 4GB MBA at the OKC Apple store and bought it a couple of hours ago. So far, I have downloaded the latest updates to OS X, as well as Chrome, and iStat, and setup Migration Assistant to copy my MBP's backup, which is on a Time Capsule, to the MBA. There were 120+GB of data to be restored to the MBA so that's going to take about 6 hours, even using an Ethernet connection. So what, though? I have attached the MBA to its charger, so all I have to do is wait for the MBA and Time Capsule to do their thing while I'm using my trusty MBP in the meantime.
All of the thrashing around I have done on the MBA so far has not caused its fan to spin up at all. Right now, in the midst of the data migration from the Time Capsule, the MBA's fan is spinning at a sedate 1996 RPM. The real test will come after I reload VMware Fusion and Windows 7, and start multitasking with a combination of Windows apps and OS X apps. I'll report on that later.