Eric Weisstein's World of Mathematics (MathWorldTM) : The web's most complete mathematical resource, assembled over more than a decade by internet encyclopedist Eric W. Weisstein with assistance from the mathematics and internet communities.
Math in the Movies Page : More than Beautiful Mind and Good Will Hunting, this page rates the mathematics and the films themselves for more than 30 movies.
Abstract Sculptures (involving mathematics): A collection of pointers to the works of several abstract sculptors. Helaman Ferguson is the best known, but they all have interesting works.
Elliptical Billiard Tables : Nice animations of the behavior of a ball on an elliptical billiard table Ð passing through a focus, passing between the foci, and passing ÒoutsideÓ the foci.
Polygonal Billiard Tables : Really nice applet to find the trajectory on a polygonal table. You can select the polygon and the starting path.
TerraServer-USA : This site lets you zero in on any location in the USA as either a topo map or an aerial photo. The data is from the U.S. Geological Survey
Anagrams : Dale T Hoffman = FDA Math Felon = Fond math flea = offhand male. What does your name equal?
DPGraph : "Dynamic Photorealistic 3D Graphing Software for Math and Physics visualization." Beautiful 3D animations and the software is only $10. (But not for the Mac.)