The National Science Digital Library (NSDL) provides a wealth of resources to assist teachers with easy access to standards, resources, and assessment tools. The author has found NSDL to be an invaluable tool throughout the school year. In particular, Science Literacy Maps (SLM) provide an online tool for navigating the National Science Education Standards (NSES) (NRC 1996) and the American Association for the Advancement of Science (AAAS) Project 2061 Benchmarks. This article provides an overview of NSDL, with an emphasis on the SLM.