I dont usually post on forums because I dont have much that is interesting to say, but zombies is something that I love. I'm obsessed with zombies, I should probably go and talk to a therapist about it, but that's another thing.
Alot of people here are saying Shawn of the Dead and Zombieland. These are good films. They parody zombies quite well. I really enjoyed both these films.
But 50 years from now, will people still talk about them, the way they do about the original Night of the Living Dead ? I dont think so personally. They will be remebered fondly for making us laugh, but The original Dead trilogy of Romero made people think about socity and how things were, they were powerful messages. Racism, consumerisim and militry rule, three things to make us think.
If you want to find the best zombie movive ever, it would probably be better to put films into sub-genres. Best zombie horror. Best zombie comedy. Best message in a zombie film.
Me, I'd say my favourite zombie film was Night of the Living Dead. It put the whole zombie film genre in the public eye, before this film zombies were the creatures of witch doctors (See White Zombie - 1932) it gave the world of cinema a new creature to be scared of, at a time when racism when was rife, Romero tackled it head on, you really care about the characters and are emotinaly attached to them.
However if I want a good laugh I watch Evil Dead 3 : Army of Darkness. Bruce Campbell as Ash is absolutly fantastic

But there's no zombies, just living dead things, if you've not seen it, watch it, you'll get what I mean then.
PS : Big shout out to Lucio Fulci, he's been criminally undermentioned on this thread. He was a master of zombie horror.