Zombies Vs Humans is a fun game mode made popular in the web version of Minecraft. It revolves around a round system, where 1 zombie is picked and everyone else is humans. Humans must escape and hide, whereas Zombies must 'infect' the rest of the humans. You infect humans by running into them. You can imagine the fun that can be had with this.

Currently implemented is:

Full round system (with changes to blocks being roll'd back at the end of each round) which is fully configurable
Lightning every minute marks remaining human locations.
Pumpkins (Jack-O-Lanterns) are equipped to Zombies heads and cannot be removed to distinguish them from Humans.
Each player starts with 20 dirt - other blocks broken do not drop items.
Hunger is disabled.
Crouching is disabled.
Commands (e.g: /alive to see remaining human names)
Score system.
And more.

Resource usage is very, very low due to the simple nature of the map, only one world ever being in existence, and only players and dropped items being the only entities. Server has been tested with 40+ players online.

Installation:

You need the plugin - put this in your Bukkit plugins folder. (StonedZombie.jar). Upon server start up, a configuration file will also be created which you can edit.

You need to set up your Bukkit server configuration to:

Disable The End
Disable The Nether
Disable Animals & Creatures
World name MUST be 'zombies' without the '.

A world file containing some template arenas that can be used and added to is available for download. This is the recommended world. You can also download a fully configured server. It is recommended that NoCheatPlus is used in addition, as this will help prevent people building 1x1 pillar towers and prevent cheaters.

A full SVN of the plugin can be found here: https://www.assembla.com/code/zombiesvshumans/subversion/changesets

A full server with template world and already configured can be found here: https://dl.dropbox.com/u/1102355/Zombies%20Server.zip 15MB Revision 8 - This can also be downloaded from this projects BukkitDev download page.

Note: When you first login, nothing will happen. Nothing will ever happen until there are 2 people online, then the game will begin.

Limitations:

Water/lava/sand is not roll'd back properly due to how my current rollback system works. Currently whenever you place or break a block, the location, block type and it's data is just pushed onto a stack. At the end of the round, this stack is just pop'd till empty. Block changes not fired by the place or break events are not pushed onto this stack, and can cause issues because of this.