A Beginner's guide to Speculative Fiction

Eve's Amlexandria has an interesting post counting down the top 14 or so works of speculative fiction that every beginner should read. Since I have only read a few of the authors (Mieville, Stephenson , and Le Guin) and only one of the works (Fahrenheit 451 - though I am 1/3 of the way through Jonathan Strange and Mr Norrell)so I should probably get started.