Caltech provides a uniquely small and interactive research environment for graduate students interested in exploring the mathematical properties of systems in physics, chemistry, biology, geology, astronomy, materials science, fluid mechanics, and any number of other disciplines.
Color Math Pink is the only web site designed specifically to help middle school and high school girls excel at math. It provides math help for students and resources for teachers.
This site is a resource for teachers with over 6,000 lesson plans and 1,200 "web quests". The topics available span virtually any topic you can think of. Best of all it's free, so visit it today and add it to your personal "bag of tricks".
This site has a math glossary, student worksheets, and teacher resources. The math glossary is easy to use, but it is not comprehensive, but it contains enough definitions to be useful, especially for the beginning mathematician.
The Explorer is a collection of educational resources (instructional software, lab activities, lesson plans, student created materials, etc.) for K-12 mathematics education.
For teachers, the Resource Room is a place where mathematics educators can share resources, teaching ideas, lesson plans, etc. For students, you can send an email to help with a math problem and there is also a math glossary. The site is in English and French.
This web page will allow you to create and print math worksheets for children learning simple arithmetic (addition, subtraction, multiplication and division).
This site offers for mathematic teachers: an open forum for the exchange of points of view about complex and timely topics in mathematics education, job postings, resources for teachers at grades 5-10.
This is a good index of useful sites for educators of all levels. Go and vote for AllMath.com and put our site in their top 50 educator sites of excellence!