These are resources for improving your understanding of math.
Alma College Math Challenge: The website of the challenge that's posted in the Math hallway.
Math Forum: Organized by Drexel University, this site provides Math help, puzzles and resources.
Wolfram Alpha: A computational engine where you can find out statistics, calculations and all sorts of information.
Wolfram MathWorld: From the creators of Wolfram Alpha, this site has numerous problems and examples to explore.