[ODB]

Here is a good workout for breathing less. (Breathing actually slows you down, particularly in a sprint).

Swim your first length with a breath every other stroke (on your right or left whichever you are comfortable with.) The next length breath every fourth, next length every sixth, then every eight, etc. until you are doing a length with only one or two breaths. Now work backwards back to your normal breathing. As you get better with this and more comfortable start doing more of your workout with fewer breaths.

You'll find that your turnover is faster as you are trying to go more strokes without a breath.

The other recommendation would be to practice breathing on each side (allows you to breath every third stroke). This is great for watching your competition and if you are doing triathlons it is almost a must to help you stay on course. This also helps with your body rotation.