Creator Recovery: Moore has admitted that he was going through a period of depression while writing Watchmen. Most of what he's written since (with the exception of From Hell) has been much more optimistic.
V for Vendetta: Moore specifically requested that his name be removed from the production after Joel Silver (the film's producer) lied about Moore's enthusiasm for the shooting script. This, and the rather poor quality of previous adaptations of From Hell and The League of Extraordinary Gentlemen, prompted his (in retrospect, possibly hasty) decision to have his name removed from any and all adaptations of works he has no ownership of, and his pseudo-royalties distributed amongst the relevant artists. Hence, he has received no money from the filmmakers behind V for Vendetta, Constantine, or the Watchmen movie.
Zack Snyder, director of Watchmen once said that the best-case scenario of ever getting Moore to watch his movie was that there might come one odd day where Moore accidentally puts the DVD into his player and turns it off after a second. Moore replied to this by saying Snyder was giving the movie too much credit.