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I think Mr. Doobs's GLSL sandbox site (gallery: http://glsl.heroku.com/) is worth mentioning, because it is a nice way to do quick experiments with fractals - rendered with full GPU-acceleration.

Here is a test with a 'Noir' Mandelbulb: http://t.co/PaBdK2DP
Here is another test with a self-organizing system: http://t.co/VBgqXsDR

Another similar site is WebGL playground (gallery: http://webglplayground.net/gallery) - which allows for even more generic programs.

Here is a test with a Ducks fractal: http://webglplayground.net/saved/C8bszjTKKF

(I was reminded about these sites, because I just saw Visual posting some pictures using mrdoobs GLSL sandbox (http://www.fractalforums.com/images-showcase-%28rate-my-fractal%29/mrdoob%27s-glsl-sandbox/msg38709/#msg38709 :-))