Like many gearheads, I've owned a lot of portable computers over the years -- and I've wanted to replace every last one with a smaller, sleeker upgrade, from the "luggable" Apple IIc onward. But most of those upgrades have left me disappointed: with the lack of software; with cheap, hard-to-use interfaces; and with "optional" add-ons that were in fact very much necessary to make the machine useful. And then the Asus Eee came around, leaving a trail of effusive reviews and eager buyers. I started to feel the same old hope