The document summarizes two case studies - The Sven Callaway Show and Skeleton - that use different Web 2.0 tools in lessons. The Sven Callaway Show allows students to see multiple perspectives on issues and gain a holistic understanding through links to detailed information and statistics. It incorporates group activities for students to apply and evaluate their new knowledge. In contrast, Skeleton lacks activities for students to demonstrate understanding and higher-order thinking. It does not engage students in problem-solving or requiring them to organize and apply their new knowledge. While it provides accurate body part descriptions, students may get distracted without opportunities to discuss or work towards a shared task.