One of my hobbies is playing around with mathematical algorithms in Actionscript. Here are a few sites I have found useful.

Code Optimization

AS3 Speed tests
This is a community maintained page of speed optimization techniques for use with ActionScript3.

AS3: Rethink your old assumptions
A bit on code optimization using constants and variables.

Fast and accurate sine/cosine approximation
More code optimization to do sine/cosine operations without using the Math class.

Bitwise gems - fast integer math
Using bitwise operations to speed up calculations.

Actionscript

Using molecular mechanics in Flash
Cool motions based on equations of attraction and repulsion.

Making Bitmap Art with Flash CS3 and WikiPedia
Art from equations.

Sites

Wolfram’s MathWorld
The web’s most extensive math resource.

Superfractals
The site resource for the book Superfractals by Professor Michael F. Barnsley

Good Math / Bad Math
Finding the fun in good math. Squashing bad math and the fools who promote it is their tagline. I just hope he never writes about me.

Articles

Iterated Function Systems and Attractors
Covers the mathematical iteration I used here.