I am very picky about the keyboard that I use. I like a specific layout with keys that aren't too quiet or too loud. The keyboard has to be very flat too, I hate thick keyboards. I prefer the Logitech illuminated keyboard personally, but a new keyboard for the touch typists at there who like click clack is set to hit later this year called the Miniguru.
The keyboard is hugely customizable with a variety of colors for the keys, body, and the track stick. Said trackstick looks just like the one that Lenovo uses on its ThinkPads to me. The keys can be had printed or blank and the thing uses mechanical switches.
The keys can be arranged to the users liking with either a horizontal or vertical enter key. The trackstick replaces the mouse and the entire keyboard is designed to allow the user to always keep their fingers on the home row.