The X220 keyboard is the holy grail of laptop keyboards as far as I'm concerned.

In addition to what you mention, it's got a big fat Escape key that's nice for vi users. This keys has shrunk on newer and competing laptop keyboards, so I've since resorted to exchanging Caps Lock for Escape.

The blatant Qwerty-centrism of Ctrl+Z, Ctrl+X, Ctrl+C, and Ctrl+V is quite annoying for many Dvorak users. In my case, I was looking to cure more than RSI, so before learning Dvorak I incidentally also learned to use a left hand mouse. Combined with Dvorak, theses shortcuts are easier. They're also doubly easier with a left-hand trackball mouse, because you can hold Ctrl down with your left thumb while you control the trackball with your left index/middle fingers, and hit Z/X/C/V, all simultaneously.