Topo! Digital Topographic Maps of States and Regions. The joining of TOPO! and Trails Illustrated/National Geographic Maps has resulted in superb detailed digital 1:24,000 topo maps on cd-rom with numerous add-on features for hiking, etc.
Digital Topographic Maps for countries in Africa, Asia, and Europe. The Soviet military mapped the world, producing 1:200,000 topographic maps for nearly the entire world. They also produced 1:100,000 topographic mapping for some countries, such as northern Africa, the Middle East, etc. These topographic maps are available as raster files, georeferenced raster files, and as vector files. The link takes you to the listing of countries for which these digital topographic maps are available.
