Improvements in portable computing technology and examples of successful pilot programs using laptop computers and other portables have inspired many K-12 schools to consider laptops for their students. In a study of Anytime Anywhere Learning, commissioned by Microsoft (published as the Rockman Report), five models were identified of laptop use currently in place at the K-12 level: concentrated, where each student has his/her own laptop for use at home or in school; class set, where a school-purchased classroom set is shared among teachers; dispersed, where in any given classroom there are students with and without laptops; desktop, where each classroom is permanently assigned a few laptops for students to share; and mixed, which is some combination of these models. While the future of mobile computing in K-12 education is still uncertain, and though solutions of cost, technical support needs, security, and equitable access remain challenges for many schools, many with laptop programs remain positive and enthusiastic about the changes observed and benefits their students derive from access to portable computers. Although many laptop programs are new and studies are still in progress, research has shown educational benefits from the use of laptops, particularly with respect to increasing student motivation and creating more student-centered classrooms. (Contains 21 references.) (AEF)