Public schools in the United States are facing a growing literacy crisis. Approximately a quarter of the population of 12th-grade students are still reading below basic levels, which means that they are barely able to comprehend at a literal level, make interpretations, identify relevant information, make simple inferences, and recognize and relate interpretations and connections. These students are at risk for academic failure, are likely to drop out of school, and have limited opportunities for postsecondary education or productive employment. To meet the needs of these students, many schools adopt professional development programs designed to improve literacy. When carefully selected and wisely used, online resources can make effective professional development even more effective, especially when it comes to improving literacy development in the middle grades. Literacy experts at Education Development Center in Newton, Massachusetts, have been developing a free Web site (www.literacymatters.org) that is devoted to "what matters most in adolescent literacy development" since 2000. They have been culling information to post on Literacy Matters from different sources, always looking for the best Web sites, articles, lesson plans, research-based and classroom-tested instructional strategies, tools, online student tutorials, adolescent literacy programs, guidelines, and book lists. Currently, the free Web site's ever-evolving content covers the following "matters": making the most of adolescent literacy, reading and writing in the content areas, adolescent literacy programs, and literacy and technology. This article presents some examples of the types of resources available on the Literacy Matters Web site. (Contains 1 figure and 3 online resources.)