http://dimacs/rutgers.edu DIMACS pages.
http://"http://forum.swarthmore.edu The Math Forum
http://www.npac.syr.edu/textbook/kidsweb/math.html KIDSWEB Math
http://www.c3.lanl.gov/mega-math/index.html MegaMath
http://www.yahoo.com/Education/Math_and_Science_Education/ 140 sites for educators
http://archives.math.utk.edu/ Math resources
Contact mahaney@dimacs.rutgers.edu
to comment, suggest useful sites, ask questions.