Zombie

*[ Your brains decreased by 6! ]
*[ Your brawn decreased by 2! ]
*[ Your endurance increased by 2! ]
*[ Your sneak decreased by 10! ]
*[ Your generic disease resistance increased by 50! ]
*[ Your stage I zombie rot resistance increased by 100! ]
*[ Your bleeding resistance increased by 50! ]
*[ Your burning resistance increased by 25! ]
*[ Your cold resistance increased by -25! ]
*[ Your generic addiction resistance increased by 75! ]
*[ Your suffocation resistance increased by 100! ]
*[ Your beating resistance increased by 3 - 6! ]
*[ Your bullets resistance increased by 10 - 20! ]
*[ Your electric resistance increased by 2 - 5! ]
*[ Your suffocation resistance increased by 100 - 100! ]
*[ Your healing resistance increased by 50 - 100! ]
*[ You've just received some new commands. ]
*[ feed : Suck the brains from a corpse or severed head. Mmmm, brains. ]
*[ howl : Let out a vile howl to summon the undead to your aid. ]
*[ puke : Puke horrible green bile all over your enemy. ] 
Apart from these, Zombie brings about a number of other side effects, including:
Claws. Self-healing. (1 health every now and again), Zombies will not attack on sight, you randomly respawn when you die (It seems you only respawn at a location with zombies), and waiting a while when dead (I.E. Not going up) causes you to resurrect (complete with revival sickness)