Enlargeable topographic map of the contiguous United States with hypsometric tints. Source: Wikipedia.
Openstreetmap, the free, detailed map of the world.
Maps of Switzerland with a time shift function.
Previous posts: Animated historical maps; maps of WWI and WWII, German relative real estate prices, European population growth, and political risk.
A political risk map by Aon to play around with; and a PDF document.
European history, 3000 BC–2013 AD: Video.
World history, 3000 BC–1000 AD: Video.
World history since 3000 BC: HTML.
Mapping tools and map collections: WorldMap. Ethnographic atlas site.