Other
Play It Safe on the Playground: Lesson Plan
This lesson plan provides plenty of activity suggestions for reinforcing playground safety. Although this is designed for primary students, it could certainly be adapted to other grades.
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Peaceful Playgrounds: Playground Safety Rules
This article explains the importance for establishing rules. You'll also find guidelines for playground etiquette and safety ideas for various pieces of equipment.
ClassFlow
Class Flow: Learning Playground Rules
[Free Registration/Login Required] This flipchart helps children to practice safety and learn to share. It explains what it means to make, enforce, carry out and interpret rules. Incorporates the book It's My Turn by David Bedford.