the beyond and demons 1&2. also, the remake of night of the living dead with tony todd was half decent

Any one see Zombie Town, I watched it earlier this year, it's pretty cool for low budget.... good script.

Day of the Dead

Night of the Living Dead
Dawn of the Dead
Savini's NOLTD '90
Day of the Dead
Return of the Living Dead

There are still quite a few well-regarded zombie flicks that I've yet to see, but so far I've enjoyed the following:

Night of the Living Dead
Dawn of the Dead
Day of the Dead
Zombi 2

Dawn of the Dead (1978)
Night of the Living Dead (1968)
Day of the Dead
Zombi 2
Dead Alive

Let Sleeping Corpses Lie

Many already pointed these out but:
Night of the Living Dead (Original)
Dawn of the Dead (Original)
Zombi 2
Return of the Living Dead
I don't know if this one counts or not but CHUD
and for a comdey zombie film. . . . . wait for it . . . . . . . Shaun of the Dead !
Undead wasnt to bad, but the ending was pointless.

Dead and Breakfast is a good zombedy.

Night of the Living Dead...original and still the best

The rest in no particular order...

Planet Terror (ooooooh boy this just might be my new fav zombie flick of all time)
Day of the Dead
Return of the living dead (my fav zombies...they just never stop)
Return of the living dead 3 (hottest fuckin girl ever when she inflicts her "pain")
Dawn of the Dead remake (fun ride never stops)
Brain Dead (zombe seckz dun rite)

Honorable mentions:

28 Days Later (very cool concept)
Resident Evil (Manson's music blasting in the theaters pales in comparison to the TV unless you got a sweet system)

Yes I know I left a lot of classics off, but these are the ones I enjoy the most. I own over 70 zombie films, always enjoy seeing something new, and have never watched one I hated (I own House of the Dead AND sequal and love em both :D ).

I am saving my Night of the Living Dead 3D for when I go to visit my friends...cant wait for that one!

Oh...and I never understood why everyone loves Zombi. I found it rather boring. I DONT want to turn this into a debate, but for those of you who love it I would just like to know why. The eyeball scene was pretty nasty, but I found myself more bored then entertained.