Please tell me of any other appropriate web-sites.
For Classes
Organizations
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AMS The official website of the American Mathematical Society. Information for undergraduates.
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MAA The official website of the Mathematical Association of America. Information for undergraduates.
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AWM The official website of the Association for Women in Mathematics.
Fun and other
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MathWorld :Online mathematics encyclopedia sponsered by Wolfram Research
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Simpsons' Math Guide to mathematics in "The Simpsons".
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MapleSoft (MAPLE)
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Math Works, Inc. (MATLAB)
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Wolfram Research (MATHEMATICA)