Just wanted to pass on this terrific little article by Triathlon coaching stud Ben Greenfield on Trifuel.com. It's called Weird Words That Will Help You Swim Faster.
The only "weird word" that I disagree with is "hide head". I see a fair number of athletes getting themselves in body position trouble by trying to push their head underwater. This also (not surprisingly) makes it difficult to breathe. If you follow the first Weird Word of "Push Lung" and you keep your head and neck aligned in a neutral position, you shouldn't have to hide your head underwater or push it down any further. Other than that, this is full of great tips to swim better.