Several trends have come together to intensify interest in how public libraries might best support the interests and needs of youth in their communities. This study reports on findings from the Public Libraries as Partners in Youth Development (PLPYD) Initiative, a 4-year, 9-site initiative funded by the Wallace Foundation to develop innovative models for public libraries to provide high-quality educational enrichment and career development programs serving underserved low-income children and youth. The evaluation reveals that public libraries can be a resource for youth in low-income communities. In addition to providing access to technology and a "safe" place to be during out-of-school hours, evaluation results indicate libraries can provide high-quality youth employment programs that include training in both specific job skills and more general personal and social skills. These programs also can have positive impacts on the library system and the community. However, to work intensively with youth requires time, financial resources, dedicated staff, consistent leadership, and alignment of youth program with library's core mission and goals. Thus, public libraries need to assess and build their capacity for youth programs and services in a systematic way.