SideTrack 1.1: Do What PowerBook's New TrackPad Does on Old PowerBooks

Apple just made the trackpad a bit better.

Scrolling through web pages or large documents on a trackpad can challenge even the most nimble fingers. That's why every PowerBook G4 features a new trackpad with scrolling capability. Just drag two fingers over the trackpad to scroll vertically and horizontally or pan around any active window. Change this feature to suit your needs: Customize your trackpad settings or turn off scrolling completely via System Preferences.

For those of us not lucky enough to have the new hardware (and it does seem to require new hardware), you can try SideTrack, which lets you do pretty much all the same things without the need for new hardware.

Kind of makes you wonder why new hardware is needed in the first place...