Split keys: you either love them or hate them. The ergonomic design, built to reduce RSI and enhance your comfort, can take some time to get used to, but after going through a month of irritation relearning to type, a lot of people never go back from Microsoft's Natural Ergonomic Keyboard 4000.
The Natural Ergonomic Keyboard 4000 from Microsoft is a beautiful piece of hardware. A soft leather-effect wrist rest complements the black-and-silver gullwing look, and you can use a bar to invert the lift on the board for maximum comfort. There's a zoom slider and customised hotkeys – both nice touches.
It's a shame the 4000 is USB-only. Setup's a cinch. Load the IntelliType Pro 5.3 software, add the board and clack away. Or rather, don't. To colleagues' relief, the board lacks that satisfying noise.