Thanks for all the good words and encouragement guys.
No worries about me staying on top of it. My wife and I have been getting a lot of calls from friends asking if there is anything they can do. So here's how we decided they can help.
We're going to tell everyone to call the school and tell the administration that they heard about a third child breaking their arm on the playground. Then tell the administration that they demand more supervision on the playground. That this IS NOT acceptable and that they are worried.
Many voices will carry the day.