This is a good resource in hard copy available for Service Work in schools. Although its main focus is on traditional Service Learning, it provides many good ideas for planning, evaluation and engaging students outside the classroom.
Cathryn Berger Kaye The complete guide to Service Learning: Proven Practical Ways to Engage students in Civic responsibility, academic curriculum and Social Action 2004, Free Spirit Publishing.
It retails at around USD$40.00 and is available from Amazon for less