Links for free cards
Here are some useful maps, listed alphabetically:

South Africa and Eastern

Antartica

Go check for yourself if all the roads are!

Argentina

Register now and visit this page for download

Australia

Join the yahoo group!

Australia

Non-routable maps (not to be guided!)

Bermuda 

Brazil

http://www.portalgps.com.br/. Choose Downloads. Thereafter, the option to translate in your google toolbar

Canada

No street name, no address ;0(

Caribbean

Non routables

United States  

Topos maps of these States:

Arizona
Colorado
Florida
Hawaii
Idaho
Mississippi
Montana
Nevada
New Mexico
Utah
Wyoming

Central Europe

Europe (routable map) 

Download European basemaps

Greece 1

Click on the map to download SetupGreece.zip

Greece 2

Hong Kong 

Iceland

Click on the small down arrow at the bottom of the page

Italy (topographic map)

Japan

Routable

Japan 

Topos

Malaysia 

Register on the site to download

Morocco  

Non routable

Mexico  

Topos, volcanoes, mountain walk

Mexico

Road maps and topos

New Zealand  

Routables: Auckland, Central north island, Deep South, Mid South, Northland, Upper South, Waikato, Wellington. Points of interest bonus

Patagonia 

Region of southern Argentina

Poland

routable map

Poland

topographic map

Russia  

Russie 

I'm not very good in Russian. Sorry. Moscow City Iles Samoa  

Singapore

Swaziland  

Topos

Tibet  

Uruguay

Vietnam

Topos and main roads (highways)