How to Make Your Speaking Easier and More Effective. This is a tip sheet published by Office of Educational Development of University of California, Berkeley. It is very concise (about 3 pages) and the tips offered are useful and convincing.

In this resource web: Teaching Resources and Publications, there are a handful of publications and tip sheets for classroom teaching. You may find something useful if you are a high-school or university teacher. For example, I also find this useful: Ten Ways to Make Your Teaching More Effective.