I've posted a gallery of rank insignias for House Atreides based on screengrabs and pictures of props I've been able to find. Unfortunatly, no actual rank names are given in the movie or script and the table is clearly far from complete.
Anyone with infos (movie related, not from the book) feel free to share or add yourself directly.
[url]http://insignias.wikia.com/wiki/House_Atreides_(Dune_Movie)[/url]