Originally Posted by aeh
Ross Greene's Collaborative & Proactive Solutions (aka, collaborative problem solving, prior to copyright dispute with MGH), which takes a strength-based and win-win approach:

"The Explosive Child"
www.livesinthebalance.org

This has been a very useful book in our house, too. We bought it when our DS was 5 or 6. First time he saw it, he was excited, "Did you buy me a new chemistry book?"