Finding Spatial Data for Mapping (GIS)

United States detailed
Census Tracts, Counties,Populated Places, Major Roads, Major Water, Cities , Parks, Rivers, ZIP Code Points, etc
World
Cities, Continents, Countries (generalized), Countries 1992, Countries 2000, CountryWatch Demographics (table), Country Memberships of Political Organizations (table), Lakes, Rivers, etc.

Cities, Continents, Countries (generalized), Countries 1992, Countries 2000, CountryWatch Demographics (table), Country Memberships of Political Organizations (table), Lakes, Rivers, etc.

Cities, Drainage Systems, Lakes, Rivers, Roads, Road Routes, States