Well I watched Land of the Dead this morning, and I must say that is one excellent zombie flick. I would rank the Romero dead movies like this Dawn, Night, Land, followed by Day. Land just can't come before Night, but they could be really close, maybe a tie for second favorite (I'll have to watch Land again, and see if it holds up to repeat viewings). Of course this doesn't include any of the remakes, or similar premise movies like Return of the Living Dead series, 28 Days Later, Zombie, etc.
It had some good gore moments, although like Dawn of the Dead there were more than a couple laugh out loud times too. That might be why I enjoy most of the Return movies also, you get a great dose of horror, but they still manage to provide some comic relief. :P
Speaking of good gore I heard that High Tension (U.S. name of the french film Haute Tension) has some really gory bits. I just couldn't bring myself to watch the half dubbed/cut version that Lions Gate shoveled out, so I picked up the uncut french version (Switchblade Romance the U.K. name of the same french film?!) dvd. So I'm looking forward to watching it at some point.