Rereading How to Win Friends and Influence People (once again). That book never ages. May very well be the best book ever written. I'm guessing most of you have read it, but if you haven't, I urge you to order it right away! It will be your best purchase in a long time.
Also just finished Genome (http://www.amazon.com/Genome-Autobiography-Species-Chapters-...). Good read, but there are better books in the category.