"Parents" magazine - advice by age (mostly geared to younger children). Health & safety issues, etc. http://www.Parents.com/
WebMD� - All medical issues, discussed by age group. http://www.WebMD.com/
Bright Futures @ Georgetown University - resources and downloads for parents and professionals. http://www.brightfutures.org/mentalhealth/pdf/tools.html
The organization that has done significant work in the field of Relational Aggression. Filled with great information and resources http://www.opheliaproject.org/main/
Excellent and informative site explaining many aspects of Relational Aggression http://www.teachersandfamilies.com/open/parent/ra2.cfm
Excellent article about Relational Aggression in Middle School http://jea.sagepub.com/cgi/content/abstract/24/3/303