"Gallowwalkers" is a zombie movie starring Wesley Snipes - a zombie movie / western.
"World War Z" is a zombie apocalypse movie starring Brad Pitt - with super fast zombies.
UPDATE - World War Z is kind of a sucky movie. Good graphics, but the plot is a tad boring. I give it 3 stars out of 5.
Also on the horizon is "The 4th Reich", a zombie movie starring Sean Bean - with zombie nazis.
And... The Harvard Zombie Massacre... starring nobody famous, but interesting because it has "smart zombies".
And last but not least...
The remake of "The Evil Dead" is already out in theatres. Haven't seen it yet. Not sure if I want to, the originals were so hilariously good.