While one of them air powered nail gun things from No Country For Old Men would be sweet, it suffers from that whole, "What happens when you run out of ammo? Can't just hop in the car and drive to the store to buy some more, now can you?" And regardless of what type of zombie we're dealing in here (fast, slow, magically enchanted brain-dead, reanimated dead, infected, etc), melee seems like a bad idea across the board. Vehicles need fuel. Firearms need ammo... I think that if I must take 1 ultimate weapon to aid my survival in the next zombie apocolypse, I want brain power. More specifically, I want the brain power of MacGuyver's writers, or even a CSI writer. With their brain power and my desire to not die a death most foul, we will improv our way through the end of the world, and into a brighter future. If she's female, all the more versatille my weapon of mass destraction she be.