[Gallery of Succulents] [Our Garden] [urban4est.net] [Floratherapy]
The following links will answer many of your questions about succulents.
http://www.tarrex.com.au/catalog/cat%20pics/pics.htm This site has some good pictures for identification and a catalog for ordering.
http://www.brookside-nursery.com/ For those in the U.K. this is a good source for succulents. Check out the catalog.
http://www.massey.ac.nz/~sglasgow/cactus/cactuspictures.htm A nice collection of succulent & cactus pictures.
http://kuentz.com/panorama3.htm A beautiful collection of succulent pictures and descriptions. In French
http://collections.ic.gc.ca/gardens/Horticulture/Horticulture%20Photo%20Catalogue.html An excellent photo collection of succulents arranged by environment.
http://groups.yahoo.com/group/other_succulents/files/ A Yahoo group for succulent enthusiasts.
http://www.desert-tropicals.com/Plants/Xeriscape.htm An excellent aide to gardeners in the Southwest U.S. Contains a lot of information on the plants suitable for arid climates.