The zombie apocalypse story is pretty much entirely plotted, and the only thing left to do is the actual writing, which, now that I know where I'm going, will be easy enough. As long as the characters don't go sneaking about behind my back again, that is.
(Yeah, I'm having some minor title issues due to a) my ignorance of video games post-dating the NES (There's The Sims, and WoW, and, er, that's all I can think of), and b) my continuing struggle with my brain, which keeps suggesting overly British titles and references. Sigh.)