This would be a "must-read" or "must-listen" for you:

http://getfitguy.quickanddirtytips.com/how-to-prevent-cramps-when-exercising.aspx

Enjoy.

Ben

Actually, swim cramping can be caused by plantar flexing in your foot. Basically your foot is constantly flexed back (straight line from knees to toes). You can try to relax your ankles more, so that your feet are not in constant flex.

There's an article here on it:

http://www.swim-city.com/library.php3?id=119

I get that too sometimes. I find that a good push off the pool wall helps and to bring the ankle back to neutral (90 degrees or so) as previously mentioned does the trick.

BT