Melissa Taylor of Imagination Soup points first to your local library for summer reading programs, but has program suggestions to keep your kids reading through the summer. "They may want to participate in a huge national program or maybe the local library summer reading program is more their speed. Maybe an individual challenge will motivate them the most."
Barnes and Noble – Imagination’s Destination
Sylvan Book Adventure
Pottery Barn: Summer Reading Challenge
KCEdventures Genre Challenge for Summer Reading
Scholastic Summer Reading Challenge