From Melissa at kids online playground Dizzywood.com:
NetSmartz - http://www.netsmartz.org/
Adina's Deck - http://www.adinasdeck.com/ - videos and worksheets on cyberbullying; you can also book an assembly with the cast and crew
iSafe - http://www.isafe.org/ - training curriculum on Internet safety, including cyberbullying; also offers iMentor program for students to educate their peers on the topic
Center for Safe and Responsible Internet Use (CSRIU) - http://www.cyberbully.org/ - tips for parents and educators, including worksheets for students
Cyberbullying.us - http://www.cyberbullying.us/
Digizen - http://www.digizen.org/ - UK-based organization offering classroom resources, including a cyberbullying film, teacher's guide and lesson plan
From Amy at Shaping Youth:
I'd add the Ad Council/Nat'l Crime Prevention PSAs which are good teaching tools on cyberbullying prevention and imposter profiling: http://www.adcouncil.org/
From a 16-yr. old boy's firstperson experience: this fellow in Australia had much to say: http://thewoodverdict.
And on the Megan Meier/Lori Drew MySpace mom indictment: Andy Carvin (pbs teachers) wrote a good post bringing up 'terms of service' issues here: http://www.pbs.org/teachers/
Finally, here are a few of my own "link-laden" posts to cyberbullying resources/prevention/info, including the Harris Interactive poll/pdf, stats, to add to Melissa's starter list! http://www.shapingyouth.org/
p.s. Of course, for real-time forums/w/pragmatic peeks at kids' foibles: Anne Collier's ConnectSafely is always insightful/pragmatic (but she's on this list so that's a given) and her NetFamily News is a must read...For tween books/fiction novels on the subject (informal experiential learning akin to Adina's Deck) here's a recent book out too: http://www.amazon.com/Truth-
From Dave at G2 Strategic Services:
The following link contains very relevant content for parents.
We also just launched a new community site that she/he can join.
Feel free to share any more links you may have.