I seem to recall a very small roller-controller that fit on your index finger, and was rolled by your thumb. I want to call it a Thumbelina (but maybe I'm just making that up), and I remember seeing on in use (step-sister's laptop) back in the days of the 486. Wonder what they've done with it over the last 20 years other than make it optical.

While I don't think just any random person should be making commentary on every movie they can think of (but if they want to, that's cool), I know a lot of people who know *way* more about film than I do, and would like to hear some of them rambling in a TrackZero style during some of my favourite movies.

http://www.trackzero.net/ has been doing this for a while, and sometimes it's funny, sometimes it's not, but hey, they're doing it.