Dune books

Prequels, far past -10,000 years pre-dune ("Legends of Dune" series + short stories):

    Dune: Hunting Harkonnens (short story)
    Dune: The Butlerian Jihad
    Dune: Whipping Mek (short story)
    Dune: The Machine Crusade
    Dune: The Faces of a Martyr (short story)
    Dune: The Battle of Corrin

Immediate Prequels ("Prelude to Dune" series):

    Dune: House Atreides
    Dune: House Harkonnen
    Dune: House Corrino

Great Schools of Dune prequels

    Sisterhood of Dune
    Mentats of Dune
	Navigators of Dune

Herbert's Dune trilogy (main timeline), with 3 chronologically-inserted Anderson books from "Heroes of Dune" interquel and couple of KA/BH short stories:

    Dune (FH)
    Paul of Dune
   		"The Road to Dune" short story (FH)
    Dune Messiah (FH)
    The Winds of Dune
    Children of Dune (FH)
    Road to Dune set (2005, not related to FH's short story above) by KA/BH:
        Alternate Dune story (Spice Planet)
        Herbert's letters related to publishing Dune
        Missing chapters
    2 short stories ("A Whisper on Caladan Seas", "Dune: Wedding Silk")

Future books in chronological order:

    God Emperor of Dune (FH)
    Heretics of Dune (FH)
    Chapterhouse: Dune (FH)
    	"Dune: Sea Child" short story
    Hunters of Dune
    	"Dune: Treasure in the Sand" story
    Sandworms of Dune