New Kneetop PCs

An ultralight, superthin class of computers that run all day on a battery? Sign me up

When I got my svelte, 4-lb. IBM Thinkpad last year, it made my old Mac PowerBook look obese. At 7 lbs., the Mac was a laptop in the same way that a bull mastiff is a lapdog. You need a pretty big lap. But my ThinkPad was so small and powerful, I figured I'd take it everywhere. On the train, Mr. Productivity would write his columns, answer his e-mail and even "test" a game or two.

But I soon became jaded. The computer was too cumbersome to throw into my briefcase and haul back and forth daily. I found it...

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