Don't forget the Hoagies links:

http://www.hoagiesgifted.org/math.htm

http://www.hoagiesgifted.org/physics.htm

http://www.hoagiesgifted.org/mathematics.htm

I also like the Mathing Group off at yahoo for links/resources of fun stuff.
http://groups.yahoo.com/group/MathingOff/


My son enjoys the Zoombinis games, Crazy Machines(more physics than true math) and Math Blasters on the computer. He also loves any and all math oriented puzzle books. Zaccaro's Primary Math Challenges is also his idea of a fun evening! Games he's enjoyed include Count Across, Count Down and Set.