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Here's the version I was playing with.  I changed a number of things, so you'll want to run the exe in the debug folder.  Also, you might want to lower the number of iterations and the max number of raymarch steps in the .fx file, since I have it set to a very high quality which only runs at a few FPS on a high end GPU.  On a low end one, it would likely crash the driver due to the watchdog timer timing out.

http://dl.dropbox.com/u/424639/mandelbulb.enforcer.v1.zip