1. The Negotiation Doesn't Start Until Someone Says "NO"
2.Your Bargaining Partner Will Be Happier if You Make Several Concessions Than if He Gets What He Thinks He Wants.
3. It's Never About Money
4. Your Bargaining Strength is All in Your Head
5. Any Reason is Far Better than No Reason, and Nearly as Good as an Excellent One.
I Found #2 to be of the most value to me.