Images and text
Fractal Gallery: What Is a Fractal
Gallery of Mathematics - The Mandelbrot Set
Ivars Peterson's MathLand
A high school student explains fractals
The Mathematics of Chaos
The mathematics of fractals
Mandelbrot Set -- from MathWorld
Alien fractal
Green fractal
Interactive applets
The Fractal Microscope
Tree Fractal
Math Wolf's favorite
Visual Experiences that defy categorization
Kaleidoscopic mathematical interactive
images
A Meditation on the Mandelbrot Set
Tesselations
Animated tesselations
Fractal Bullet Gif from http://www.fractalwisdom.com/FractalWisdom/index.html