Of all the browser based zombie MMOs out there, I found this one to be the best IMO. I tried out Dead Frontier, Urban Dead, etc... yet, this one seems to fuse both games with a good looking visual and game mechanics that makes you stick to it, unlike the others that eventually bored me. I think the main storyline is that island of Manhattan (or something really close) got quarantined and all the survivors and military got behind, left for dead. You take the role of a survivor.
Try it out guys, my Character's name is Bernard Fenix.
If you would be so kind to use this link as a form of recruiting so I can get extra in-game experience, I would appreciate it: http://www.zombiepandemic.com/free-zomb ... rid=377581