currently reading Dune.. it's so great.. is the movie as good as the book?
The Hollywood version with Sting playing Feyd and directed by David Lynch sucks monkey balls how badly they f#cked up the book.
While not perfect but much better than the original movie- the Dune mini-series that the Sci-fi channel made is much better at following the story without massive changes. It's a 3 disc set(the director's cut) but you can probably find it at a discount store for pretty cheap.
Generally I really don't like movie versions of books it's really hard to condense a book's plot into a visual medium like film but some do a pretty decent job.