GENERAL INFORMATION

Ask Dr. Math ('E' 'M' 'H')
Doctor Math is actually a team of college students, professors, and teachers. Site is an archive of questions and answers organized by elementary, middle school, and high school grade levels. Topic search feature is also provided. Maintained by Swarthmore College.
Search Dr. Math archives by grade level:
Teacher resources: forum.swarthmore.edu/dr.math/
Search Dr. Math archives by topic:
Teacher resources: forum.swarthmore.edu/mathgrepform.html

Math in Daily Life ('M' 'H')
Part of the Annenberg/CPB website and excellent in its coverage of common examples that show how math is a valuable part of our everyday decision-making.
Teacher resources: www.learner.org/exhibits/dailymath/

S.O.S. Math ('H')
In their own words, "S.O.S. MATHematics is the Web site of the Department of Mathematical Sciences at The University of Texas at El Paso, where you can work with materials to help you: do your homework; prepare for a test; get ready for class. The material presented here reviews the most important results, techniques and formulas in college and pre-college mathematics. The learning units are presented in worksheet format and require your active participation!"
Teacher resources: www.math.utep.edu/sosmath/

WebMath.com ('E''M''H')
This site is an interesting one. It boasts that Webmath is a math-help web site that generates answers to specific math questions, as entered by a user of the site, at any particular moment. ... The math answers are generated and produced real-time, at the moment a web user types in their math problem and clicks "solve." In addition to the answers, Webmath also attempts to show to the student how to arrive at the answer as well.
www.webmath.com/