Human Evolution
BecomingHuman.org - This is an excellent web site, which offers video and narration on human evolution. 
ChinesePreHistory.org - Explore fossil evidence for human evolution in China at this web site. 
Naples.net - This site examines the melatonin and testosterone in human evolution
Rutgers.edu - Visit the Center for Human Evolutionary studies at Rutgers University.
ECOTAO.com - Human evolution web site, which explains the various hominids in detail (australopithecus, neanderthals, etc)
Artsci.edu - Explores the evidence of mitochondrial DNA and Human Evolution
PBS.org - This site contains a simple activity on human evolution