Exercise! Any type of physical activity helps.
Eating a good breakfast every day helps your metabolism get going in the morning.
Strength training helps too, I think.
Kelly315 - that works so great for me. It just sort of kick-starts your body. I did that when I was on Atkins & it always worked. And even now that I'm just eating less calories it helps a lot. It takes a couple of days to get rid of the water weight, but then you get back to losing.