After my last couple of posts talking about my favourite comic book writers, I was just wondering just how much work Alan Moore HAS done in the past. Found a site with his extensive bibliography:
Alan Moore Bibliography
Wow...that's a hell of a lot of stuff he's written over the last three decades! The following comics are probably Moore's most seminal work though:
Warrior Magazine (which was an anthology magazine that featured the original seralisations of V for Vendetta and Marvelman, later renamed Miracleman)
V for Vendetta
The League of Extraordinary Gentlemen
And of course, he's famous for some of the best stories DC has ever published such as "Whatever Happened To The Man Of Tomorrow?" from Superman #423 and Action Comics #583, "For The Man Who Has Everything" from Superman Annual #11, and of course, the very famous one-shot Batman: The Killing Joke.
Although he didn't have very long runs on some series, some fans would remember his works on Spawn, Violator, WildC.A.T.s, Supreme, Voodoo, Youngblood, and Glory. Strangely enough, most of these books are from Image comics or one of their offspring companies (Wildstorm for WildC.A.T.s, Todd McFarlane Entertainment for Spawn and Extreme Studios for Glory)...certainly all those titles I've listed are from Image Comics!
To answer Theo's query (even though it's technically not a query), the Alan Moore "works" that have been made into movies have been League of Extraordinary Gentlemen, From Hell, V for Vendetta and the upcoming Watchmen, in THAT order.
It must be noted that Moore does not want to have anything to do with ANY of those movie properties though. More of that can be read in his Wikipedia entry here. I remember reading from somewhere that Moore read and gave his approval of the Watchmen movie script though!