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Some links I like.
The Program of Mathematics Education
MacTutor History of Mathematics Site -- St. Andrew's University
Math Forum (alias Geometry Forum)
Assignment 1 Linear functions Assignment 2 Graphs of quadratic functions Assignment 3 Parabola as the locus of vertices of other parabolas Assignment 4 Medians of a triangle Assignment 5 Script tools Assignment 6 The parabola Assignment 7 Tangent circles Assignment 8 Altitudes and Orthocenters Assignment 9 Pedal triangles Assignment 10 Parametric curves Assignment 11 Polar equations Assignment 12 Compound interest