well, I bought an Eee (4G) to bridge the gap between now and when I can finally get a chance to see a MacBook Air in person. My PowerBook has been going strong for more than four years, but the motherboard is finally starting to get iffy, and I no longer trust it. I figure I can float by on the Eee for a few weeks until the Air shows up in stores. If I like the Air, then I'll get one, if not, maybe a MB Pro. I see the Eee as a perfect temp. laptop. I'm not planning on lasting a year on it, but a month or two of light use, maybe. Of course, if I'm blown away by the laptop, I'll just hold off on the MacBook a little longer and build up a little larger cash reserve.
Once the Eee shows up (in a few days), I'll know better where I stand.