"Teachers Teaching Teachers" ("T3") focuses on coaches' role in the professional development of teachers, exploring challenges and rewards that teacher leaders encounter. This issue includes: (1) Making a Serious Study of Classroom Scenes: High School Faculty Develops Away to Observe and Learn from Each Other (Valerie von Frank); (2) Tools for peer sharing; (3) Voice of a Teacher Leader: It's That Simple--Avoid Complexity (Bill Ferriter); (4) Focus on NSDC's Standards: 6 Ways to Ignite Teachers, Coaches (Joellen Killion); (5) Lessons from a Coach: Mentors Help Shape His Coaching; and (6) Research Brief: Learning Requires Time, Quality (Carla Thomas McClure). (Individual articles contain references.)