Evil Dead 2 by a country mile.

Bruce Campbell OWNS all zombies.

Bottom line________________________________

As for how those early zombie apocolypes started...

Nobody knew what the fuck a zombie was. People just saw these weird looking drunk guys... and got bit that way.

After that it was a pack mentality type thing.

Or at least that was how Night of the Living dead worked.

Suddenly there were these murderous cannibals all over the place. With so many... eventually a giant mob is going to be too much to push away. 

They stopped being a problem once the army and really even just people with guns figured out what zombies were and how to deal with them.

I've seen only the number 3 and 9. Damn!! There is a lot of movie i gotta check out!

I think Quarantine needs to be on the list (forgot about it). That was a fantastic movie about what would really happen in an outbreak. I congratulate TWestern for mentioning it.

The Crazies looks good. The best, however, will be World War Z, when it comes out.

Well due to some weird twist of fate, the original Night of the Living Dead from 1968, the movie that started this whole modern zombie movie mess, is in the public domain, so it's free to watch at Google Video:

http://video.google.com/videoplay?docid=-2956447426428748010&ei=2CncSrbKKqLwqAPP5Pj6CQ&q=night+of+the+living+dead#

Thanks a lot my friend. ^_^

Damn a lot of ppl listing ZOmbieland ...movie that good huh definitely checking it out then.