You simply must check out this utterly fascinating (and gag-inducing) insider's look at the outrageous 10 year development hell on multiple Superman flicks that never got off the ground.
Including Tim Burton's proposal complete with Kryptonite-bleeding Doomsdsay, Kevin Smith's Brainiac polar bear fight scene, Nic Cage's multiple hissy fits, a Superman who dies and a Krypton that fails to explode. As they say, read it and weep, people!