MegaMath -- brings unusual
and important mathematical ideas to elementary school classrooms so that
young people and their teachers can think about them together.
Odyssey of the Mind -- Promotes
creative team-based problem solving in a school program for students from
kindergarten through college. It has a huge list of lesson plans.
The Geometry Forum -- Has Math
related student projects, newsgroups and archives. Also has a searchable,
annotated collection of useful educational sites.
