Have you seen the "Weight Loss and Skin FAQ
" sticky thread in Maintainers? Check it out...some good stuff there.
Also - you need to be advised that if it works at all, Mederma (or generic Mederma) works best on new stretch marks (pink/reddish brown/dark brown marks). Once the marks are silvery/white, they're usually there for keeps (unless, of course, you have that portion of skin removed during plastic surgery). (this is according to Mederma's own FAQ on their website
Here's an interesting article written by Paula Begoun (author of Don't Go to the Cosmetics Counter Without Me
The Skinny on Stretch Marks