Real time world and US population statistics, updated every minute. This and much more information found at American FactFinder.
16th- Early 20th Century Maps of Africa: From Northwestern University, this site features digital copies of 113 antique maps of Africa and accompanying text dating from the mid 16th Century to the early 20th Century.
David Rumsey Map Collection: The David Rumsey Collection was started nearly 20 years ago, and focuses primarily on cartography of the Americas from the 18th and 19th centuries, but also has maps of the World, Asia, Africa, Europe, and Oceania. The collection includes atlases, globes, school geographies, books, maritime charts, and a variety of separate maps, including pocket, wall, children's and manuscript.