Smithsonian Institution
National Museum of Natural History: The Origin of the Genus Homo
The evolution of the Genus Homo is neatly laid out in a chronological fashion beginning with the key change that signaled the origin of Homo, through the evolutionary forms, finalizing with Homo sapiens.
Talk Origins Archive
Talk Origins: The Hominid Species
Talk Origins gives a broad description of the types of Hominid species, and then gives a description of each species. Includes the specific characteristics of each, and explains the differences between the species.