Print Maps:

In the USA or Canada it is easy to find good, up-to-date road maps of those countries, but this is not true of Mexico.  All the road maps of Mexico that I have seen for sale in the USA are inadequate, inaccurate and out of date.  By far the best Mexican road maps are made in Mexico by Guía Roji.  They make a huge variety of maps -- country, state and city maps as well as an atlas which I use.  Here are links to on-line stores where you can order them.  Note that these stores sell other brands of maps, so be sure you are ordering Guía Roji if you want the best.  I recommend their Atlas for greatest detail.

Guía Roji has very good street maps of several cities in Mexico. http://beta.guiaroji.com.mx/

The site also has a catalog of their highway maps.

http://tienda.guiaroji.com.mx/Default.aspx

The default language of the website is Spanish, but English is available by a click in the upper right corner.

http://www.mexicomaps.com/index.lasso?id=BD9D4FDB1dfb62C17DgHm40DFB3A offers  Guía Roji maps and many others including a typographical map of Copper Canyon and several GPS maps.
 

On-Line Maps:

http://dgp.sct.gob.mx/index.php?id=440  This website has highly detailed maps of the states in Mexico plus a 2-part map of DF.  They are in a PDF format which can be zoomed and saved to your hard drive, but they cannot be printed.  They are for sale in a large format.

http://dgp.sct.gob.mx/index.php?id=442 contains a number of route maps from various cities to DF.

These two maps are by the Secretaria de Comunicaciones Y Transportes (SCT)  They are the most detailed maps I have found.

http://mexico.pueblosamerica.com/ This site provides highly detailed information on the location and population of even the tiniest villages.  The search is State>Municipality>town.  I think this one is amazing.

A good on-line map and trip planner can be found at http://mappoint.msn.com/(l42a22n11w50b33jquvtkz45)/directionsfind.aspx?&src=MP&regn2=0

Another trip planner website using a less graphical mapping technology http://www.expedia.com/pub/agent.dll?qscr=mrfn  

This map site offers detailed maps of the Texas/Mexico border crossing towns in the lower Rio Grand area:
http://www.texmaps.com/rio-grande-valley-bridges.html 

There is a lot of useful information here:  http://www.maps-of-mexico.com/

And here: http://mexicochannel.net/maps_en.htm 

This one is especially for RVers: http://www.ontheroadin.com/

Archeological sites map: (neat stuff here) http://www.ancientmexico.com/content/map/index.html 
 

This website gives a cartoon route map, mileage (kilometers), typical drive time and tolls (pesos) for travel between any two points on the Mexican toll road system.  It's in Spanish.

Rutas Punto a Punto

GPS Maps:

General information about GPS and product recommendations:

http://gpsinformation.net/

http://www.bicimapas.com.mx/Mapas_GPS.htm bilingual

Vendors:

http://www.mexicomaps.com/index.lasso?id=BD9D4FDB1dfb62C17DgHm40DFB3A

http://www.travelbygps.com/maps/mexico.php

http://www.garmin.com/

http://www.magellangps.com/en/products/product.asp?PRODID=1233

http://www.gmap.com.mx/ in Spanish
 

INEGI = Instituto Nacional de Estadística Geografía e Informática is a government agency that makes and sells a wide variety of geographical maps.  They have stores in most larger cities.  It's a toy store for map lovers.

They have a wonderful on-line map in Spanish that takes a little playing with to learn how to use, but if you need to know about mountains, valleys and rivers, it's great. 
http://galileo.inegi.gob.mx/website/mexico/viewer.htm 

And finally, Google Earth presents interesting and informative views of Mexico (and any where else).  http://earth.google.com/

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