Human Biological Variation, 2nd Edition
This is the most up-to-date and comprehensive text on human variation I have seen.  The authors use excellent examples to elucidate the role of evolutionary forces on human diversity, and they present complex concepts clearly. --Lori Baker, Baylor University (need permission to use quote as edited)"The authors provide an illuminating overview on the history of thinking about race and the classification schemes that have been applied in this arena...Importantly, the authors emphasize humans as social creatures, nothing that our capacity for culture has uniquely influenced our evolutionary trajectory. In most areas, the book is successful in reaching its goals, whereas others could leave readers unsatisfied. Nevertheless, this volume would be appropriate textbook for an upper-division undergraduate or graduate-level course." -- Brian Kemp,The Quarterly Review of Biology