Index Google
Maps including satellite, traffic, and bird's-eye views.  
Bing Maps  
Interactive maps, directions and traffic, satellite and aerial images, and bird's eye view.  
CIA: World Factbook  
Country-specific information compiled by the Central Intelligence Agency.  
Google Earth  
View satellite imagery, maps, terrain, 3D buildings, and even the canyons of the ocean.  
Google Maps  
Browse interactive maps, find local businesses, and get driving directions.  
Aerial/hybrid imagery and various tools for road navigation.  |  Also: MapQuest Atlas  
Nation Master  
Atlas containing maps with numerous informational overlays.  
Leading provider of premium-quality digital map data and content.  
World Atlas and Maps Library  
World atlas with links to regional, country, and state maps.