Art Marketing - There is a gallery with books and mailing lists that include information about artists.
Artist Online Biz - (Archive) a guide to art and artist information on the Web. This might be a good source for teacher to "discover" new contemporary art to inspire lessons. This link is provided for teacher use - all artists have not been checked.
Artist Rising - (Archive) When it was online, this site boasted 409,783 pieces of art from 75,845 members. This site was a division of art.com and they also have a list of artists.
Levy Creative - Founded by Sari S. Levy represents artists who work in a wide range of styles ranging from traditional painters & digital artists; 3-D animators & web designers. Our portfolio of artists include: Alan Dingman, Shane Evans, Thomas Fluharty, Max Grafe, Kris Hargis, Jenny Laden, Rob Magiera, Timothy Okamura, Roberto Parada, David Rankin, Oren Sherman, Doug Struthers, Jonathan Weiner. This is a "cool" site. Has children's book illustrations too.