1) Download & install CraftBukkit at http://www.bukkit.org/
2) Download the mod, click download above
3) Put the file into the "plugins" folder
4) (re-)start your server
/godmode - Makes you invincible.
/godmode [player] - Makes the specified player invincible.
Temporary fix for conflict with Essentials' "/godmode" command:
/godmodeon or /godmodeon [player] - Turns on godmode if possible.
/godmodeoff or /godmodeoff [player] - Turns off godmode if possible.
/heal - Heals you.
/heal [player] - Heals the specified player.
/maim [player] - Beats the specified player within an inch of their life.
/slay [player] - Kills the specified player by no special means. They just drop dead.
/smite [player] - Works the exact same as /slay, used as a workaround for conflict with worldguard.
/slay [player] arrows or /slay [player] a - Kills the specified player by shooting them with flaming arrows!
/slay [player] fire or /slay [player] f -Light the player on fire until they die.
/slay [player] drop or /slay [player] d -Drop the player from an immense altitude where they will plummet to their death!
/die - Kills you.
/jesus - Allows you to walk on water like Jesus. Also allows walking on lava. Not so Jesus-like, but it looks cool.
/inferno - Use your godly rage to burn the ground behind you! (!!!Warning, this will place fire ANYWHERE you walk, so be careful of flammable materials!!!)
/superjump - If there's nothing in your way, you will jump to obscene heights!
/zeus - With this activated, lightning will strike where you're looking when you swing your arm!
/gaia - Turns dirt to grass beneath your feet and plants tall grass and flowers around you as you walk.
/vulcan - Fling fireballs at those pesky mortals! - Requires craftbukkit 906+
/demigod - Decreases damage taken by a configurable amount. Reduced to 20% by default. (See godPowers.properties to change the amount)