Here are some links to some bullying prevention programs. Many were recommended through research studies.

These programs mostly target K-8 ages school children:
Steps to Respect
Olweus Bullying Prevention Program

10 lessons designed to Stop Bullying Now!:
Education World

These websites have useful tips and work to prevent the growing problem of cyberbullying:
STOP cyberbullying
What do I do if my child is experiencing cyberbullying?

You can find out more about preveting cyberbullying and reporting cyberbullying on this site:
Wired Safety