This past summer, in a sixth-grade math class, New York City schools chancellor Joel Klein piloted a small program in which individualized, technology-based learning takes the place of the old "let's all proceed together" approach. Each day, students in the School of One are given a unique lesson plan — a "daily playlist" — tailored to their learning style and rate of progress that includes a mix of virtual tutoring, in-class instruction and educational video games. It's learning for the Xbox generation.