Opportunities for online K-12 education are expanding dramatically throughout the United States. This paper describes some of the organizational models that have been developed to provide online education to public school students, including their key strengths and challenges. The review is intended to help state and local school officials weigh such issues as cost, finance, access, and effectiveness as they consider alternative organizational models for delivering online education to their students. [This report was produced and funded by the Appalachian Technology in Education Consortium at The CNA Corporation, Alexandria, VA.]