School counselors are a good place to start. Kids need someone to talk to. They need to be reassured that life will go on and that the anger, sadness, and resentment that they are currently feeling will eventually ease. If the school counselor is unavailable or doesn't work out, ask him or her for a few names of child therapists in your area. Find out if the Youth Commission in your town offers counseling services.
Many communities provide counseling on a sliding scale basis.
If your child has a friend whose parents are going through a divorce, you can help by talking to your child about being a good friend. It's important for children to know that their friends are there for them and that in the midst of major upheaval, some things remain unchanged. This web site provides articles about various aspects related to divorce. While most are targeted at parents, there are also articles aimed at kids. Reading about other kids who have survived divorce offers kids much-needed reassurance.