Explain management decisions. Employees don't always see the sense in new rules and regulations. Invite their suggestions for improvements. It will not only give them a sense of participation above and beyond their usual roles, but may gain some valuable ideas. Promote from within whenever possible.
Nothing destroys morale like seeing the next rung of the ladder occupied by an outsider.
Respect differences of opinion. Don't take an employee's challenge of your idea as a personal affront. He may know something you don't and help you avoid committing a world-class blunder. Give public appreciation for work well done. Few things massage a worker's ego like being praised in front of his peers.