Perfect for the traveling man in all of us, this Kensington Acco is a pretty boring USB Calculator, but comes alive when it doubles as a numeric keyboard that can work nicely with your crappy laptop keyboard. It's got a LCD display, has a 19-key layout and looks sleek to boot. Also lets you do a calculation on the calculator, then paste it straight to your computer with a "send" button. Retails for $35.
Kensington USB Calculator/Keypad [Biosmagazine]