CZ is a journalist who has that enviable knack of making science interesting and topical, without mushing it down to a lowest-common-multiple in the process. It's a rare gift (grits teeth at this point). I first struck his writing in 'At the Water's Edge' - a marvellous trek through macro-evolution, which for me answered most of the 'but where are the intermediate forms?' questions. There were eight-fingered fishy things, a clear exposition on how genes could simply experiment with physical forms, the eternal question (much beloved by fellow apes who are still inclined to miraculous explanations of their origin rather than accept the bleeding obvious) of how eyes could have evolved, and so on.
He (CZ) is also responsible for 'Parasite Rex' - which is very useful for terrifying the squeamish, is not to be discussed at meal-times, and which contains perhaps the best explanation I've seen for (and a typically gorge-raising possibility for fixing) Crohn's disease.
As well as his own website, he also blogs over at The Loom.
Speaking as one with 65% fish genes, I thoroughly recommend these works. Look out too for his latest: 'Soul made Flesh'.