Math problems and puzzle sites:

www.math.utah.edu/~cherk/puzzles.html
www.learner.org/exhibits/dailymath/
www.math.hmc.edu/funfacts/
www.qbyte.org/puzzles/

Other Math Resource Sites:

www.amatyc.org/

www.mikesmath.com

home.brevardcc.edu/youngr/

mathematicianspictures.com

Math News from Science News 

portals.merlot.org/mathematics/

Developmental programs that work
The Mathematical Association of America

Resources for Teachers of Developmental Mathematics

www.learner.org/  (Download free math videos after registering)

The Math Forum@Drexel: Learning and Mathematics Research in Math Education