Nay nay and thrice nay.
Williams has nothing at all to do with fractal mathematics. He may use the right buzz words, but it's clear that he's applying them to his own ideas (which, iirc, revolve around a couple of moving averages and scaling into positions). The guy's a total charleton imo.
(note : have only got New Trading Dimensions: How to Profit from Chaos in Stocks, Bonds and Commodities, read it once and threw it away)
The only worthwhile (as it aplllys to the markets) book I've read recently is The (Mis)behaviour of Markets: A Fractal View of Risk, Ruin and Reward by Mandelbrot.