First, there's the fact that all of the keycaps are moved around to the DVORAK scheme; not because I type in DVORAK, but because I once wanted to. I type well enough that I never have to look at my keyboard anyway, so it doesn't bother me at all. It keeps casual "can I borrow your workstation for a minute" trespassers away, though. Sort of a keyboard encryption scheme.
Secondly, it is built to withstand nuclear war. My gift for hyperbole notwithstanding, this keyboard is indestructible. I have poured large cups of coffee on it, and done significantly more damage to myself than the keyboard. On one occasion, a maintenance man used it to stand on in order to change out flourescent lights. From it's general appearance, it was used during the Battle of the Bulge to help give armored vehicles additional traction.
It may not be translucent, or have the latest web keys, but at least it doesn't have a windows key.
Finally, it weighs a metric ton. I can place it firmly on my lap (with only two assistants spotting me) and it won't move for the rest of the day. Yes, my legs are numb within an hour, but I can type in that most comfortable of positions... reclined.
What's your favorite keyboard, and why?