Math Links (serious and otherwise)

Math ArXiv	Math ArXiv Pre-Print (e-print) server. Get the latest math articles without waiting for journal publication.
	The American Math Society's MathSciNet is a searchable Web database providing access to basically every math article in print from 1940 to the present. (Requires subscription)
	A pretty detailed Topology Glossary
	The Clay Math Institute has designated seven Million Dollar Problems. Try and solve one of these!
	A list of Famous Problems in the History of Mathematics, from the Math Forum Project.
	The Fields Medal is the math-equivalent of a Nobel Prize.
	The Mathematics Genealogy Project lets you trace your math family tree by advisor.
	Similar to Math Geneology, The Erdös Number Project measures how far removed you are from Paul Erdös, by publication.
	At Jeff Weeks' Topology and Geometry Software page, you can download the SNAPPEA program, a great tool for studying hyperbolic 3-manifolds and knot complements. He also has torus and Klein Bottle games like tic-tac-toe, chess, mazes, crossword puzzles, word searches, and jigsaw puzzles.
	Ever wonder about colors on the surface of a bubble, or the shapes formed when bubbles meet? Here's a page that'll explain everything you ever wanted to know about bubbles, from chemical composition to minimal surfaces, thin film interference to bubble recipes.
	The Mandelbrot and Julia Set Explorer is one of the best sites I have found for studying these sets. There you'll find an on-screen java applet that is interactive and user-friendly. Clicking a point in the Mandelbrot set zooms in on a region, and displays the associated Julia Set for that point. (For a powerful downloadable program, look elsewhere for the free FracTrip.)