There's been a really good track played on the
Digitally Imported - Chillout channel called The Dune Mix by Mike G. It runs for 75 minutes and captures the qualities of the book and Lynch's film. I just discovered that you can listen to this (and others on demand at
www.ambientmusicguide.com. In particular
this page for Mike G's stuff (including his regular shows from 2007).
And just in case you're lazy, here's two direct links: