I'll keep this one short: If you took every keyboard ever made and condensed them to their most elemental parts you'd end up with the Apple Wireless Keyboard ($70). It's pleasant to type on (it feels just like the current MacBook keyboards). It has just enough tilt to be comfortable, thanks to the cylinder that holds the two AA batteries in the back. There is a light that turns on for a moment when you hit the button on the side, which is invisible underneath the surface of the metal when not turned on.
There isn't even an Apple logo on visible on the front.
It would work fine on a Windows machine, but all the fancy function key controls for screen brightness or iTunes playback wouldn't work. The lack of a 10key and larger arrow keys would be more of an issue for most.
It's a distillation of keyboards down to the most basic. I bought it for a car PC project I'm working on for a 1975 car. That it looks period in the car that was designed three decades before says a lot about the timelessness of clean design.