Great news for you distance and fitness swimmers!  I just found a great new product....Swimovate Pool Mate.  It's a wrist swim computer.  It will keep track of your laps, in all strokes automatically!  What a great idea!  Not only does it track your laps, but it tells you how you're doing during your workout.  Check it out!  I think you'll be as amazed as I was when I found it.