I'm sure everyone knows these ones, but they're my favorites:

The Evil Dead
Army of Darkness
They Live

Here's a good one. I've never met anyone else who's seen it though:

Phantasm II - Not a zombie flick, but there are these little midget animal things, like fat gremlins.

And last but not least, I don't even know what kind of movie it is, but I suppose it could be considered horror, and it definitely is cheezy:

The Forbidden Zone

Dan, with comment number 2, shut the hell up.