Endless Forms Most Beautiful

This is one of the best popular science books I've read in a while. It is an explanation of Evo Devo and the contributions the discipline has made to genetics and our understanding of evolution.

Carroll takes the reader through key experiments, many of which he was involved in. This is an excellent way of getting across difficult concepts. It takes a bit of effort on the reader's part, but it's worth it.

The final chapter is absolutely amazing. It is the single best argument for science and evolution (as opposed to against religion / intelligent design) that I've read. In fact, it may be the only argument that I've read that concentrates on the science -- and tries to get people excited about the science -- rather than spending time slamming religion.

I highly recommend it.