film/video/print graphics:
- there is an animated sequence on the Jurassic (I think it's Jurassic) extinction that has all these dinosaurs looking up from what they're doing and seeing all these comet chunks hitting the ground. That image is totally ingrained in my head, and I have no idea where it's from (I want to say discovery channel, or something, but I also feel lik it's really old).
- all the recent apocalypse movies: Dennis Quaide and the big wave, the comet one- I don't actually see any of these, I just respond to the big teaser image they put in the trailers
- probably illustrations from physics and astronomy books

literature/print media:
Stephen Jay Gould's books on mass extinctions. The Book of Revelations. nearly every cover story from Science Journal or the Economist in the last year or so

that's all I can think of for now, I'll keep on it though.