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Wolfram Alpha http://www.wolframalph.com/
Answer questions, do math, instantly get facts, create plots, calculators, unit conversions, scientific data and statistics, help with homework and much more!
Your Teacher http://www.yourteacher.com/
Offers thousands of online math lessons with your own personal math teacher.
Paul's Online Math Notes
Paul Dawkins of Lamar University has compiled some very nice lessons, reviews and cheat sheets for his college students and has made his materials available online. The lessons are very thorough, with lots of worked examples and sensible advice regarding common mistakes. This link is for Algebra but he also has notes for other classes including Calculus.
This site has lessons on basic algebra topics and techniques, study tips, calculator advice, worksheets and more.