There's also a video called "State of the Art, the SPFX: The Empire Strikes Back" that is pretty good and one of the only ESB focused docos. Available where ever you find the rest of that stuff.
On a completely different note, does anyone have a high quality picture of the birds eye shot of the Sail Barge set (as seen in the interview in the first post of this thread)? I hadn't seen that picture before and I would like to use it as wallpaper for a bit. Thanks