The internal motivation to learn sets adult learners apart from children. Self-directed learning is associated with adult learners with the maturity to realize what they need to know and the internal motivation to learn it. This article provides sites to learn more about adult learning and resources to help support one's own informal, self-directed learning. Among other things, Infed: Informal Education and Adult Learning, from the UK National Grid for Learning, has resources to explore the theory and practice of informal education and lifelong learning through an encyclopedia of key ideas, practices, and thinkers. It archives materials, including classic works by Lindeman and Knowles found at http://www.infed.org/.