The Priory Group have some excellent guides.
Guide on childhood anxiety
Guide on teenage depression
A comprehensive list of eating disorder helplines

Here are some links to organisations that can support young people or those working with them:

Life Coach – Youth Coaching – Some information on coaching for young people and the benefits it can have.

MyTutor have a page outlining mental health issues young people might face in education and a series of helpful links.

Counselling Directory – A confidential service that encourages those in distress to seek help. The directory contains information on many different types of distress, as well as articles, news, and events.

90 Self Esteem Resources for Girls – A huge selection of resources for promoting positive self esteem from Online Counselling Programmes