In no particular order (yet)

• Terry Pratchett
• Neil Gaiman
• Neal Stephenson
• Tad Williams
• Leo Tolstoy
• Stephen R. Donaldson
• Frank Herbert
• Douglas Adams
• David Eddings (the early books)
• Stephen King (especially the Dark Tower series)
• Thomas Pynchon
• David Foster Wallace
• Stephen King
• William Gibson
• Kurt Vonnegut