Listened to it today; very, very well done. Big improvement over the original. Can't wait for the next episode.
I've noticed that several other games have zombies, or at least a zombie-esque plot device. KotOR I had rakghouls, Fallout had ghouls and those deformed centaurs, and hell, Half-Life 2 had a whole chapter chock-full of zombies.
As for Wallace & Gromit, I hope they have the shady penguin from The Wrong Trousers: