Nice work!

As the application name, I'd suggest "Gearbox"; a saved collection of gears could be called a gearchain. A quick Googling failed to turn up any obvious conflicts with proprietary tradenames; the "gearbox programming" references are almost all about cars. Unfortunately SourceForge does already have a project named gearbox -- a Java visual debugger.

More features for the vapor-ware list: add support for gears with multiple inputs -- like one that takes two incoming files and returns either all the lines, or only those that appear in A but not B, etc, etc -- or multiple outputs -- so that you can tee some intermediate version out to a WriteFile gear and also run it through further processing.

Consider adding a property to some or all gears that cause them to be interactively re-configured each time the gearchain is run; for example you could build a gearchain that performed a type of log file analysis, and every time you clicked "run" it would ask you which file to read from.

For what it's worth, the video also doesn't work on Mac OS X's Quicktime player, nor do the slides render on most of the Mac browsers I tried: OmniWeb 4.2, Safari 1.0, or MS IE 5.2; luckily the Mozilla browsers did the trick.