If you prop the back of your keyboard up (as Apple’s current designs force you to do), I’m guessing you type with your wrists flexed and you probably rest them on the desk as well. Flexing your wrists restricts free finger movement and is bad for tendons etc.; resting your wrists on the desk makes the matter worse by placing pressure on this part of your arm.

(On the other hand, I agree wholeheartedly about the chiclet keys – it’s virtually impossible to be fast and accurate with them.)

http://www.halfbakery.com/idea/Telescopic_20display_20for_20laptop

It’s been known since, oh, the 1950s that keyboard pitch is a big deal. If the pitch is flat, the keyboard is very tiring on the wrists. Steve Jobs has generated hideously non-ergonomic keyboards since his NeXT days, when the NeXT keyboard had a roughly 0 pitch and was so despised by the community that the company was forced to invent little feet in the back that you could install in the old keyboards to prop them up. Now of course Steve is back with his grotesque new Mac keyboards which not only have a zero pitch but awful chiclet keys with almost no tactile feedback, making them extraordinarily difficult for fast touch typists to type rapidly on.

No matter. The public, having seen lots and lots of laptops by now, which are basically forced to have a zero pitch, now assume that zero pitch is a good idea rather than a compromise made necessary by laptop shape. But you, not having to make that that compromise, still chose to keep your keyboard in the same pitch as your laptop was. A sort of Stockholm Syndrome, I must assume.

I bought it on a whim last year after my entrance exams got over. College never left me with enough energy to attempt reading that book.