Ethnologue (http://www.ethnologue.com/web.asp)
Geographical Names Database (http://gnpswww.nima.mil/geonames/GNS/index.jsp)
Global Gazetteer (http://www.calle.com/world/)
Maps
Cornell Geoscience Interactive Databases (http://atlas.geo.cornell.edu/webmap/)
AUTOTYP Map Tools (http://www.uni-leipzig.de/~autotyp/download)
Ljuba Veselinova's Linguistic Map Collection (http://bamse.ling.su.se/~ljuba/maps.shtml)