Mexico and Central America

Browsable text-based website providing population and coordinates for all cities and large towns worldwide. GoogleEarth positions also available.

Orthophotos, tabular data, and other products from INEGI.

Entire country at 1:250k, select areas at 1:50k. Geology themes on INEGI base maps in PDF format. These maps could be saved to high res TIF or JPG and georeferenced into a GIS as a reference layer. The datum is ITRF which aligns extremely closely to WGS84 (they're identical for these purposes).

Free GIS data from Mexico at 1:1 million scale. Note that the content and level of detail in data is suggested by the file size.