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Greg Tang, author and mathematician, has written many children's books about math (check out your local library to see if they have any of his books!), and he has a Master's in Math Education from NYU.  His website is full of classroom materials, games, and puzzles for both the math teacher and the math student.  Check it out!

classroom activity in down time

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

interactive math puzzles and problems

Solve the tower problem and test your theory by varying the number of disks. Fun Math Puzzle.

Games the teach/reinforce the pythagorean theorem

A collection of mathematical problems that are designed to challenge students of all levels.

A site with problems designed to motivate and challenge students. 

GeoGebra is a good way to learn geometry

Mathy brain teasers which could be useful for regaining attention during class, reactivating students' minds

A blog about math, puzzles, teaching, and academic technology

Place for educators to share ideas. Has problems and puzzles, online mentoring, research, team problem solving, collaborations, and professional development.

An online community for teachers & students who have an interest in math. On the site, students can find extra help through Ask Dr. Math. Teachers can access Math tools as well as professional development resources.