The spirit of giving back is upon us: Young people are replacing summer camp with service trips, and baby boomers approaching retirement age are searching for ways to give back to their communities. With the number of new groups in the nonprofit sector growing by 70,000 a year, it will need more support than ever. BusinessWeek's Jessi Hempel talks with Dr. Tim Seiler, director of public service and the Fund Raising School at the Center on Philanthropy at Indiana University, about how to attract volunteers and why they are so crucial to keeping the sector vibrant
