There is a lot of information about South American food on the internet, and you can find something new every day. I just came across the announcement of a new iPhone app (and mobile website) from Nestle, with 300+ recipes from the micocinalatina.com website using evaporated milk. The app is called the "Latin Recipe Shaker" because you can apparently shake your phone (and a virtual can of evaporated milk on the screen) to view a new recipe.
Personal food blogs can be wonderful resources for learning about South American food. I discovered this creative recipe for macaroon sandwich cookies made with dulce de leche at a beautiful food blog called Teeny Cakes. (Cajeta is another name for dulce de leche, along with manjar and arequipe).
This food blog, Mangio de Sola, has a great 3-part series of instructions (with lots of photos) for how to make tamales. The third installment, Assembly and Finale, is especially useful for learning how to wrap tamales using dried corn husks.