Here are some great links. They include some benefits of being bilingual, how we acquire language, and how this method of teaching works.
Books and Articles by Stephen D. Krashen: Public access to the works of one of the world's top language acquisition experts
TPRStories: Karen Rowan's site giving an overview of TPRS methods and other resources
Teaching in the target language: Article by Helena Curtain
Being bilingual may boost your brain power: Text and audio from NPR's Morning Edition
Study of Mandarin Chinese By U.S. Students Booming: Blog from Education Week on foreign language enrollment trends in the US
Hearing Bilingual: New York Times article on the brain development of bilingual and monolingual babies
Books and Articles by Stephen D. Krashen: Public access to the works of one of the world's top language acquisition experts
TPRStories: Karen Rowan's site giving an overview of TPRS methods and other resources
Teaching in the target language: Article by Helena Curtain
Being bilingual may boost your brain power: Text and audio from NPR's Morning Edition
Study of Mandarin Chinese By U.S. Students Booming: Blog from Education Week on foreign language enrollment trends in the US
Hearing Bilingual: New York Times article on the brain development of bilingual and monolingual babies