Miscellany

Terry Tao
Pete Casazza
Palle Jorgensen
George Lowther
James Bramble
Michael Lewicki
David Donoho
Bernhard Bodmann
Petr Klapetek
Allan Pinkus
Carl de Boor
Tina Kapur
Thomas Strohmer
Tian Xiao He
Gabor Herman

Daryl Geller
Jens Christensen
Azita Mayeli
Eric Sawyer
Mauro Maggioni
Triet Minh Le
Philip Gressman
Andre Boivin
Giovanni Leoni
Ming-Jun Lai
Bassam Shayya
Chuck Rosenberg
Peyman Milanfar
Vignon Oussa
Amara Graps
Jelena Kovacevic

Math Overflow
Math Stack Exchange
Math Genealogy Project
Constructive Approximation
Constructive Approximation and Applications
Approximation Theory Group
Numerical Harmonic Analysis Group
Wavelets, Frames, Operator Theory
Jacket's Wavelets
Martin Vetterli's course on wavelets
Wavelets.org
Image and Computing Group
Rice Digital Signal Processing Links
Compressive Sensing Resources (Rice, archived)
Compressed Sensing and Single Pixel Cameras
Math Software from PLUME
Geophysical Data Processing

Arachnoid
Game of Life
Simpsons Math
Math Puzzles
Stamps and Words
Fractal Maker
Vector Park
Chess.com
1920s Slang
The Onion
Project Euler

Textbooks that have interested me.
My math genealogy tree made with cmap.