Microsoft has come out with a document for teenagers to help them gain a proper understanding on the risks involved with being online. This is a good resource to provide your children that are beginning to want to share information with their friends online.
Shelter your kids Online
K9 Webprotector type Protection
http://download.live.com/familysafety
Kids Menu – Windows Replacement Shell for Kid computing
http://glob.com.au/kidsmenu/