1. American Gods by Neil Gaiman
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    Back in 2013 this was in development at HBO, and it fell through. Fingers crossed it gets on Starz like Wikipedia just informed me.
  2. Gaea Trilogy by John Varley
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    Varley's website indicated that Terry Gilliam was at one time interested in directing.
  3. Wheel of Time by Robert Jordan
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    I might get a lot of hatred for this, but this should absolutely be an animated series. I don't understand why this hasn't happened yet. Hey Cartoon Network: would you like to make *all* the money?
  4. Neuromancer by William Gibson
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    The moment that I realized this could be successfully filmed was when I saw Rinko Kikuchi in Pacific Rim and realized that she would be fantastic as Molly. I read on IMDb that Neuromancer has been in various stages of development, for a long time. At one point Liam Neeson was mentioned as a possibility to play Armitage.
  5. Any of DC 'Elseworlds' comics, but JLA 'The Nail' or 'Kingdom Come' would be my top 2
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  6. The Night Circus
    Suggested by @szczesnyt
  7. Lord of Light by Roger Zelazny
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    (For real this time, CIA.) This would be redonkulous as an Amazon or Netflix series.
  8. The Three Stigmata of Palmer Eldritch by P.K. Dick
    Suggested by @elizabeef