I had browse through the net today and stumble upon a forum with a post regarding the movie 'V For Vendetta' and found this link http://www.mtv.com/shared/movies/interviews/m/moore_alan_060315/ which is an MTV interview with the cartoonist who wrote the original graphic novel. I have read a few tidbits of how Alan Moore was not happy with the way his works (From Hell, Constantine and The League of Extraordinary Gentlemen) were 'hollywoodfied' by all parties involve with little respect to the original.
After reading the article I must say that the man, despite his caveman like hairstyle, is very intelligence, literated and poetic in his own style. You would not be surprise from this article that he really is the one who wrote all the lines that V spoke in the movie.
It is an interesting read. If you like the movie you should read this article too :)