I was browsing around as you do and bumped into an interview with F Herbert & D Lynch from around the time of the unparalleled 1984 film.
The first 10 minutes or so are about the Movie and it's making and the last 30 minutes or so it's just Frank taking DUNE, Sure a lot of the themes that are discussed have been covered before in other interviews but it's worth downloading anyway.
Edit to add the links,
http://www.megaupload.com/?d=IRJFF8Q2 part 1
http://www.megaupload.com/?d=QFTZ9G6F part 2
http://www.megaupload.com/?d=LVHQ1QZD cover
Sorry I was having an attack of the stupids............... the problem is it's been ongoing for years and shows no sign of stopping
