The Visual Literacy org site has a periodic table of visualization methods:
(use Mouseover)
http://www.visual-literacy.org/periodic_table/periodic_table.html
Shown single method by using a show/hide link done by Chris Wallace:
http://www.cems.uwe.ac.uk/xmldb/rest/db/Visualization/showAll.xql
by category
http://www.cems.uwe.ac.uk/xmldb/rest/db/Visualization/index.xql
Other visual literacy maps
http://www.visual-literacy.org/pages/documents.htm
Visual Literacy Papers
http://www.visual-literacy.org/pages/articles.htm
