A book we published in April, The Pea and the Sun: A Mathematical Paradox, is currently fluctuating around the 200-300 range for its Amazon sales rank. I believe that's pretty unprecedented for a book of ours. Amazon did a direct marketing thing for it for people who bought a similar book, so I imagine that's the cause. I would imagine we're going to start talking about reprinting it.
And, yes, if you haven't been able to tell, my life is pretty focused around my job right now, and I'm actually quite content with that. It's a stupendously superific job.