With the ThinkPad X300 (about $3,000 street), Lenovo is out to prove that the Apple MacBook Air is not the only laptop that can fit snugly into a manila envelope. Granted, it's a tough act to follow and frustrating, too, especially since the ThinkPad X300 was being developed at the same time as the MacBook Air. Apple made it out of the gate first, putting together a marketing campaign and creating the kind of suspense only it can pull off. But let's be practical and set aside this race for thinnest laptop. The ThinkPad X300 is an all-around, more sensible solution for business travelers. It weighs about the same as the MacBook Air, depending on how you configure it, and the removable battery, a built-in optical drive, integrated WWAN, and multiple USB ports make this little ultraportable much more desirable from a business standpoint. How to write off the $3,000 price tag, however, is another question.