Teen Entrepreneurs
Starting a business has never really been subject to age, but there wasn't a whole lot of opportunity for a teenager to build a business before there was that thing called the internet. Be it websites, or just selling custom picture framing on a place like Ebay, the internet has opened the door to almost anyone to earn money with out being an employee.
Although I tend to think mostly of the opportunites available online, this article on Teen Business Tips gives all kinds of ideas that will help young money grubbers get their start. It wouldn't hurt most adults to check them out as well since there is gold in them there hills!