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I also like to use the UltraNuv buttons together with the trackpoint (nipple). Trackpoint + the middle button - nothing beats this for scrolling. Except maybe C-V and M-V :)

It's called TrackPoint. I got so used to it that now I buy a USB thinkpad keyboard for my desktops too.

There are quite a few names for it depending on the "tone of conversation":

http://xkcd.com/243/

I also like Track-Point on my ThinkPad. Probably the benefit is that I can use it without removing any of my hands from the keyboard.

We call it cl...r (other part of body).