1. Do fun things together. Teams come together through "shared bonding experiences". It's uber-important to do activities with your team members that allow them to be more of their true selves and connect with each other as human beings. This will directly translate into superior team performance.
2. Praise publicly, coach privately. Smart leaders understand the power of publicly praising excellence in action. So do it often. Coach your teammates as to areas they need to improve in private. So they can save face.