The Bradshaw Foundation has posted an interactive website that shows the migration of mankind over the last 160,000 years. Very interesting and very informative.
From the Bradshaw Foundation website:
The Bradshaw Foundation, in association with Stephen Oppenheimer, presents a virtual global journey of modern man over the last 160,000 years. The map will show for the first time the interaction of migration and climate over this period. We are the descendants of a few small groups of tropical Africans who united in the face of adversity, not only to the point of survival but to the development of a sophisticated social interaction and culture expressed through many forms. Based on a synthesis of the mtDNA and Y chromosome evidence with archaeology, climatology and fossil study, Stephen Oppenheimer has tracked the routes and timing of migration, placing it in context with ancient rock art around the world.