DZS is fantastic, so much fun.
They are up to version 1.25 now I think, many more tweaks and options added.
Some of these now include dynamic missions, survivors friendly and not populating a town and the addition of more choppers and vehicles. Many more environmental and zombie AI tweaks too.
The real beauty of DZS IMO is that it is just a standard Arma multiplayer mission, it can be used on any map, even custom ones and hosted privately like any other mission. This means LAN, locked servers and the ability to play and host at the same time if your connection and PC can handle it.
You can also port the entire mission into the editor and add anything you like from the Arma engine, we mucked around for awhile building mad max-like bases and adding more enemy AI, custom vehicles and ACE mod gear.
Well worth checking out!