For the ultimate in surf photography go to Oahu, Hawaii and check out Pipeline in winter. Lovelly blue water, huge and powerfull wave plus all the action is close to shore so you can get away without huge tele lens.
Check my shot with silly little old pocket camera. Quality is crap and waves were small but potential is there

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Your Canon D40 is a nice piece of kit and I'd like to upgrade my 400D with one like yours. I use mine for macro work, as I make living by making porcelain teeth

- world away from surf photography.
Few years ago, there was guy from Italy in here who does surf phography for living. Visit link below to his profile page on this forum. Under 'About Me' tab, you will find link to his home page with examples of his work, and under 'Statistics' tab you can find his posts relating to his art.
Surf Newquay Forums - View Profile: photorepetto
Hope you find them usefull.
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Ivan Knezevic Grant
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Master of all trades, Jack of none!