Del Toro's AT the Mountains of Madness (still fingers crossed)
Darren Aronofsky's Flicker (the film I want to see most).
Worst Case Scenario (holds breath - I love the teaser)
Stuart Gordons Shadow over Innsmouth (though he did get to do it eventually as Dagon)
Tim Burton and GEEK LOVE one of my fave books)
Not Horror:
Jodorowsky was meant to do Dune at one stage.
Who Killed Bambi? by Russ Meyer
Neuromancer - many people were attached to this at one stage.
Orson Welles's Heart of Darkness
Max Castle's Heart of Darkness :-P