DarkSyde continues his series of interviews with science bloggers at DailyKos with this interview with Carl Zimmer, hands down the best popular science writer working today. If you want an almost perfect book that explains how scientists go about filling in the details of evolutionary lineages, you can't do any better than Zimmer's At The Water's Edge. He details the data on the evolutionary transitions both out of the water (the first tetrapods) and back into the water (dolphins, whales and other marine mammals) and also tells the stories behind how that evidence was found. Great book, great writer.