I discovered these newsletters this morning, and want to make sure other teachers are aware of these articles! You WILL have to sift through many issues, since a lot of the articles are specifically about RCM requirements, etc., BUT, these were some that I found useful:

MAR/APRIL 2003 - Making Time for Technique, Technology in your Studio (p.1-6)

JAN/FEB 2003 - Learning Harmony at the Keyboard (p.1-3)

JULY/AUG 2006 - Keyboard Harmony vs. Written Harmony Examinations (p.1-3)

SEPT/OCT 2006 - Developing Musicianship Through Ear Training & Sight Reading (p.1-4)

MAY/JUNE 2003 - Tips on Memorization (p.3)

RCM's "Music Matters" newsletter:
http://www.rcmexaminations.org/teachinfo/index.htm

i've been getting this newletter by mail and reading it on the website for years. although a lot of it is geared towards preparing students for RCM exams, you can apply the excellent informations to many other aspects of your teaching. like john said, they're defo worth the read.