about "Writing for Children and Teenagers"??? A friend of mine saw an article in a womens magazine, a full page color ad about an aptitude test for childrens writing. They claim to teach you how to "crack the market" if they think you have the talent. Claims it's a free test and an into to a course. I'm feeling like I should be very very careful....

:D
I think you're probably looking at courses from the Institute for Children's Literature, which is actually legitimate and a pretty good program. Have a number of friends here and on Verla's and in my local writer's group at home who've taught for them-- they have a good rep. Maybe google them for more info if you're curious?
Writing, like anything else, can be learned-- so writing well is all about sustained effort you put into improving your work. Getting outside crit is a really, really good thing-- made a huge difference for me.(but a good local crit group, or cyber crit group can work too-- doesn't have to be school!)
Though I do worry about writing something, turning it in to someone and find out that someone else ran with it, yanno?