I'm not much of a horror fan but I loved Night of the living dead (the newer colour version)
Another one HAS to be '28 days later', I saw this horror flick last night and I absoloutley loved it! everyone should go see it, its a british film about a virus and thats all I'll say, no spoilers. I give it 9/10, pretty much one of the best horror films I've ever seen, done so well and might well make you jump out ya seat at times if turned up nice n loud
go see it if you can!