Recently Laura (pingVision's President) mentioned a screencast tool she thought might be helpful in developing video content.

Screencasting is a terrific way to engage in online demonstrations, allowing for a more engaging experience than using still shots. I have used tools like SnapZ Pro, which work quite nicely, but most tools require that you capture your screen actions, your audio, and/or your video seperately and then edit them together using something like iMovie, Adobe Premiere, Final Cut, or Avid.

Vara Software has developed a tool called ScreenFlow that melds all capture and editing into a simple-to-use software package. ScreenFlow not only captures your screen, video, and audio but during editing allows you to zoom, pan, and highlight portions of your screen in a fairly intuitive way.