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Dell's Latitde XT2 (review) is a rugged 12-inch convertible that's geared toward business users.
The 13.3-inch Fujitsu Lifebook T900 (reviews) comes with Intel's new Core i-series chips and runs on Windows 7.
The Panasonic Toughbook C1 comes with a Core i5 processor and weighs in at only 3.2 pounds. Panasonic's thin and tough tablet laptop is about as small as they come for rugged portables.