Anything by Romero from Land of the Dead and beyond is just crap. He's lost it.
To whoever mentioned Re-animator, Bless You. One of the all time greats.
Rammbock: Berlin Undead is a very good indie film. Does a very nice job with limited space and budget. Plus, it's only about 60 minutes, so.....
I liked Versus - although I wouldn't really consider it zombie, but that's just me.
Shaun of the Dead is just f**king brilliant.