1973's Messiah of Evil (aka Dead People, aka Revenge of the Screaming Dead) (trailer) is arguably the greatest Lovecraftian arthouse zombie movie ever to be written and directed by Oscar-nominee friends of George Lucas. [more inside]
Survive the Outbreak: Interactive zombie movie. At certain points of the movie you will be prompted to make a choice. What would you do? You'll most certainly die, but at least you get to come back and try again. *NSFW due to profanity.
Homecoming - anti-war movie from National Amusements featuring the ungrateful dead. This will possibly invoke some controversy.