American Federation of Mineralogical Societies National (USA) Mineral Society
Midwest Federation Regional Mineral Society
(AK IL IN IO MI MN MO NE ND OH SD WI)
http://edtech.kennesaw.edu/web/rocks.html Lots of great links here.
http://www.fi.edu/fellows/fellow1/oct98/index2.html Digging with Rocky the Rockhound.