Here's a great article on found on seven easy ways to inmprove your freestyle.
By: Sarah McLarty
"An oddly similar phenomenon happens during swim training as well: You are hungry for improvement in your swimming yet have a limited budget of time and knowledge to spend on it. It’s a sad reality, but most triathletes just don’t have the time or money to invest in a good swim coach to watch and correct their strokes. Sometimes the closest thing to a coach available is a spouse, training partner or lane-mate who may share a piece of advice during practice. Athletes training solo can glance over at the faster swimmers and try to mimic their smooth strokes or, as a last resort, one can utilize swim tips from a world-class swimmer in a triathlon magazine."
1) Don’t hold your breath.
2) Relax, relax, relax!
3) Align your spine.
4) Remember to glide
5) Rotate, but don’t over-rotate
6) Never cross the forbidden centerline.
7) Kick from your hips
Read the entire article on Competitor Magazine.