This is a hard issue for me to thumb my nose at. Child labor was the historic norm for all pre-industrial societies. And to a degree, child labor is still practiced in Western agriculture - ask anyone who grew up in a farming community.

As far as I understand, the majority of chocolate production in places in Africa is still people hauling sacks of cacao into a market to be hauled away by middlemen. The only real immediate solution is to industrialize the supply chain (corporately managed plantations and processing plants), or stop consuming products from these regions altogether.