IBM sell keyboards with the UltraNav components built in. I love the nipple, and if everything goes to plan, I'll get one of these keyboards to use at home and the office. The ultimate setup for me would be their 20" screen that does 1600x1200, with my laptop in the dock off to the side giving me another 1400x1050 pixels. The issue with this is that the keyboard on the laptop would be inaccessible. Not with one of these badboys plugged into the docking station.

My biggest complaint with the Mac is the lack of nipple. I seriously love the nipple.