This reminds me a bit of the myth where people think you can "sweat out toxins", when in reality, there is nothing secreted from your sweat glands except water and salt. Toxins are carried through your kidneys, not your skin.
Anyhoo, I'd take any excuse to get a massage twice a month! Even if it doesn't help cellulite, it will probably have a great effect on stress levels! I have friends that are massage therapists who do swear by the "lymphatic release" thing with the right type of massage, but I'm not really sold on it. I just like the way it feels
Oh, and I've been told that if you were having trouble just barely squeezing into a dress, let's say, and you had a big occasion to go to, that you could get a body-wrap that morning, and fit into it that night. However, the next day it's all back since it's just dehydrating you. Probably not the healthiest thing in the world, but I guess in a pinch it's like a chemical girdle.