Visual Calculus. (There is a section on Pre-calculus.)
http://archives.math.utk.edu/visual.calculus/
Equation Plotter from The Lawrenceville School. Best graphing webware I've ever seen, and it's free.
http://mathplotter.lawrenceville.org/mathplotter/mathPage/index.htm
Mathworld. The world's most extensive math resource. Great reference - rather technical, however.
http://mathworld.wolfram.com/
SOS Math. The Algebra and Matrices pages are good references for precalculus students
http://www.sosmath.com/
Ask Dr. Math. Answers to a lot of common questions. Good Explanations.
http://mathforum.org/dr.math/
Karl's Calculus Tutor.
http://www.karlscalculus.org/calculus.html
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