The new episode of Skeptics Guide to the Universe has an interview with l'il ol' me, talking up my book and dissing asteroids and whatnot. Give it a listen! Come for the cosmic disaster, but stay for the "science or fiction".
Oh: I made a mistake in the podcast. I said the Earth's oceans will boil away in 100 million years. That number is wrong, it's more like 2 billion years. An initial calculation I did said 100 million years, but that turned out to be wrong, and unfortunately the number stuck in my head. Sorry about any confusion.