The Incredibly Strange Creatures that Stopped Living and Became Mixed-Up Zombies (1963)-The title says it all. Unfortunately, the film doesn't live up to expectations.
Night of the Living Dead (1968)-Romero's all-time classic. If you've never seen it, you're hopeless. Call in sick to work tomorrow and watch the damn thing!
Children Shouldn't Play with Dead Things (1972)-From the directory who would go on to bring us A Christmas Story comes this tale of hippie filmmakers who foolishly use voodoo to create zombies for their movie.
Dawn of the Dead (1978)-Romero's follow-up to Night of the Living Dead, a gore-splattered satire and biting commentary of consumer culture.
Zombie (1980)-One of about 10 bazillion Italian rip-offs of Dawn of the Dead, Lucio Fulci's is the best (for whatever that's worth). My friend Doug loves it. I hate it.
Dead & Buried (1981)-A small-town sheriff is plagued with murder victims that won't stay dead. Entertaining in a schlocky sort of way.
Return of the Living Dead (1985)-Unofficial sequel to Night of the Living Dead finds punk rockers battling recently resurrected zombies with a hunger for brains. Skip the sequels.
Day of the Dead (1985)-Somber, bleak and gory as hell, Romero's third zombie film is a reflection of the ugly, oppressive Reagan era in which it was made.
Re-Animator (1986)-Fellas, watch the unrated version of this one with your wife or girlfriend. If she doesn't storm out of the room or break up with you afterwards, you've got a keeper on your hands.
Night of the Living Dead (1990)-Not as good as the original, this remake directed by Tom Savini, with a new script by Romero, is still pretty good.
Dead Alive (1993)-Before he made the Lord of the Rings films, Peter Jackson made this brilliant comedy with more spilled guts than you could imagine. Only watch the unrated version; if you watch the R-rated cut you're wasting your time.
28 Days Later (2003)-OK, they're not really zombies, but Danny Boyle's heart-pounding thriller basically combines Romero's three films into one intense horror film.
Dawn of the Dead (2004)-The blasphemous remake of Romero's classic. The only problem is the film kicks ass.
Shaun of the Dead (2004)-The best blend of horror and comedy since 1948's Abbott and Costello Meet Frankenstein.