IIRC, the Science Channel talked about the yellowstone area and it's possible role in the extinction of the dinosaurs 65 million years ago and it's role in the end of mankind. Of course the same show was talking about killer asteroids and other such planet-killing, TEOTWAWKI phenomena. not much you can do to prepare for those things other than what Ben said. Increase your skill base, knowledge base, library, etc, hope you survive the initial blast and do your best to survive.

Mark, who is considering a career change but wondering if it really matters in the shadow of the apocalypse.
*doing my best Blast imitation*