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I actually enjoy both the 1984 movie and the two miniseries, because I have come to terms with the fact that Hollywood will never get a book to movie concept right. That's why they call them...

A number of them appear to be unabridged.

Yep, there are. I just checked demonoid.com for dune audio books and there are a bunch of torrents up there.

http://i54.photobucket.com/albums/g118/polkacore/dunecat.jpg

There's a pretty good miniseries that sci-fi did as well(I like it anyway). I have it somewhere if you want to borrow it sometime, I can look for it.