In this video I'll give you a quick glimpse at how I produce my instructional origami videos. I'll also write a more detailled guide, which will be published on the Origami USA website (possibly with access restricted to members).
Converting: MPEG Streamclip http://www.squared5.com/
Editing: Final Cut Express http://www.apple.com/finalcutpro/
Subtitles: Jubler http://www.jubler.org
Diagrams: Inkscape http://inkscape.org/