Another example of Microsoft's hardware design ingenuity (see previous post) is the Microsoft Bluetooth Mobile Keyboard 6000 -- It's thin, light ... and curvy.
The keyboard is only a few millimeters thicker than a AAA battery at the back, and then tapers toward the space bar and front edge. It fits in an area of around 14 x 6 1/2 x 1/2 inches and weighs 14 1/2 ounces.
And the Bluetooth Mobile Keyboard is really curved, for natural wrist position, including the individual rows of keys, so the design takes up less space than adding a curved palm rest or using split blocks of keys.
The Mobile Keyboard is priced at around $89, including a separate portable Number Pad with carrying case. Both use Bluetooth wireless technology to connect to your PC or laptop, so you can go mobile without requiring a separate transceiver dongle.
It's very nice design to work comfortably and securely on a desk, and take up a minimum of space.
See my Portable Peripherals and Accessories Gallery for more on these and related products.