Math links
I am, after all, a mathematician. As a side note, it's amazing how much research use I've gotten out of most of my "Fun stuff" links.
Blogs
Cinemathematcs: Views on film and other such topics from the mind of a mathematics student.
Confessions of a mathematician: A blog by Courtney Gibbons.
Earth science picture of the day: Each day a different image.
Easternblot: It's (not) all about science.
Evil mad scientist laboratories: Making the world a better place, one mad scientist at a time.
Good math, bad math: Finding fun in good math; squashing bad math and the fools who promote it.
Mathematics weblog: Math problems and links.
MathPuzzle: The puzzling weblog of recreational mathematics
Mathsex community: It's not about the sex, it's about the math!
More new math: Equations for living.
Think again!: Seductive math problems for the modern mind.
xkcd: A webcomic of romance, sarcasm, math and language.
Fun stuff
Acme Klein bottle: Glass Klein Bottles for sale. Inquire within.
Babel Fish translator: You'll need to put this fish in your ear
Biology of B-Movie monsters: From the Fathom Archive
Classic mathematical fallacies: From the University of Toronto
Cut the knot : Interactive mathematics miscellany and puzzles
Euclid's Elements illustrated: Scanned from Byrne's edition
Euclid's Elements online: Beautiful applets by D. E. Joyce
The Exploratorium: The museum of science, art, and human perception
Hacker puzzle: Nifty viral online puzzle.
History topics index: From the University of Saint ANdrews
Geometry Junkyard: All kinds of stuff related to geometry
Inverse symbolic calculator: Is your phone number really cool?
Geometry games: I like Klein bottle Tic-Tac-Toe
The KnotPlot Site: Beautiful knot images created by Robert Scharein
Mathematicians on postage stamps: Nice historical images... in bite-sized form!
Math in the movies: A uuide to major motion pictures with scenes of real mathematics
Math mistakes: A whole glossary full!
Math posters of the London Underground: From the Isaac Newton Institute for Mathematical Sciences
Mathematical quotations server: "Analysis is about making infinity your bitch."
Mathematics in tens: Find out what makes mathematics exciting, 10 at a time.
Online encyclopedia of integer sequences: Check out A002011 and A052510. Thank you very much.
Sam Loyd's cyclopedia of puzzles: Popular 1914 puzzle book put to the public domain.
Tiling plane and fancy: Tiling from the mathematical and historical viewpoint
Societies
AMS: The American Mathematical Society.
MAA: The Mathematical Association of America, Rocky Mountain Section.
NCTM: The National Council of Teachers of Mathematics.
SIAM: The Society for Industrial and Applied Mathematics.
Papers and e-prints
The arXiv \\ Los Alamos \\ the Front: E-print archive. I like the Front's interface best.
J-Stor: The scholarly journal archive.
Math.sci.net: Mathematical reviews on the web by the AMS
MPRESS: The mathematics preprint search system.
FUEJUM: Furman University Electronic Journal of Undergraduate Mathematics