One other method for building and maintaining enthusiasm is having regular team meetings. The word meeting in corporate America seems to be a word that almost always has a negative connotation. Why? Meetings are typically not properly organized and managed by the manager. Meetings that are properly organized, well planned, and efficient are appreciated by employees and can help reinforce a motivating environment.
Assuming that you already know how to organize and run a team meeting, there is no point in covering those details. The question is a much bigger one: How can you jazz up meetings to make them more exciting and more motivating?