Unclassed choropleth map

http://softwaresanta.com/smf/index.php?topic=2976.0

this is a Unclassed choropleth map

Bivariate Choropleth map

http://proceedings.esri.com/library/userconf/proc99/proceed/papers/pap171/p171.htm
A bivariate map displays two variables on a single map by combining two different sets of graphic symbols.

Nominal area choropleth map

Nominal Area Choropleth maps are used to display nominal data over a specified region

Bilateral Graph

http://www.mofa.go.jp/policy/oda/category/environment/pamph/2001/oda.html
This is a Bilateral Graph.

accumulative line graph or lorenz curve

http://luckybogey.wordpress.com/2009/09/02/wealth-redistribution-legal-plunder-or-just-california-dreamin/
Accumulative line graph or lorenz curve graph for showing the concentration of economic quantities such as wealth and income.

Cadastral map

http://www.dgs-gis.cz/mapy.php
This is a cadastral map that is used mostly to determine land ownership. As you can see the color represent different areas on the map.

Thematic maps

http://www.epa.gov/opptintr/rsei/pubs/demo_maps.html

Thematic maps provide a graphical summary of the selected results by state or by county. This is a state distribution Thematic map.