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Purple Math
Purplemath: Symmetry About an Axis
Explains symmetry about a line, using animations to illustrate the "rotation" or "reflection" involved in this type of symmetry.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Symmetry in Math
Defines symmetry, line of symmetry, point symmetry, and gives examples.
CK-12 Foundation
Ck 12: Interactive Geometry: 2.6 Reflection Symmetry
Explore reflection symmetry in some different shapes.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Using Symmetry to Create a Community Quilt
This site provides a hands-on lesson plan to make a quilt using symmetry.
Other
Earth Measure: Native American Geometry Designs: Mathematical Landscaping
If you want to plant a class garden, this is a great resource for combining geometry, Native American studies, and rocks.
National Council of Teachers of Mathematics
The Math Forum: Putt Putt Golf in the Math Classroom
Putt-Putt golf can be a great tool in helping students understand angles and their reflections. Here a teacher demonstrates the "Course," set up in his classroom to assist in explaining to students how to use geometry and angles in...
Cornell University
Cornell University: Isometries and Patterns
Shows the different kinds of isometries and patterns, and gives examples of each kind. Includes definitions, terminology, examples, and problems.