Kensington 33059 19-Key External Pocket Keypad and Calculator

Rating:
Summary: A must-have for mobile spreadsheet jockeys.
Review: I'm not sure why I went so long without this handy little gadget. I can now build my spreadsheets at double-speed.

I chose this particular model because you can unplug it and use it as a basic calculator, eliminating the need to carry another tool around. Compared to other calculator models, this one is small and lightweight. I can actually carry it in my shirt pocket with no discomfort (yes, I admit...I'm a geek). Alas, the compact size means that the buttons are closer together than on a standard 10-key. But the difference is small, and after a few days my fingers adjusted.

The detachable USB cable has a nifty mechanism so you can coil it up inside itself for easy packing. The plug-and-play installation was quick and seamless on Windows XP. The whole thing works like a charm.