I was saying this to K elsewhere, but I like apocalyptic fiction because of the "clean slate" aspect of it. There's still back story, sure, but in a way you already know everything important, because there's so little to know all of a sudden. It also puts you in the shoes of the character; everything they know is probably gone, too. So you get to "start over" with them. That's always appealed to me, narratively.
Anyway, this is probably why I like "Fallout 3" so much.
I read
The Road as well (posted a review in the Reading Tab thread, I believe). Not sure if I've read much more in this niche genre. I'm reading the first of Asimov's
Foundation novels which feel a tiny, tiny bit like them in that they're on such a large time scale, but it's just sort of a rough similar feel rather than a direct similarity.
I'm almost definitely going to check some of these titles out, though. Particularly if they're freely available or a few bucks in Kindle form.