PBS
Tracing Ancestry With Mt Dna
The most common mtDNA ancestor is an African woman named African "Eve" or Mitochondrial Eve. Good explanation of mtDNA versus nuclear DNA through visual interactive family tree.
Other
Progressive Humanism: Understanding Evolution
Paper from Progressive Humanism focusing on cultural selection in conjunction with Darwin's theory of natural selection.
Siteseen
Siteseen: American Historama: Social Darwinism
Learn about the origins and history of Social Darwinism in America.