Articles:

What is a Trainer? What is a Facilitator?

QUALITIES OF AN EFFECTIVE O-J-T TRAINER

USEFUL WEBSITES ON THIS TOPIC:

Train the trainer - glossary:
http://www.myceon.com/hrd/id/resources/glossary.htm

Trainer's Tool Box: TRAINER'S GAMES, TRAINING BOOKS, SIMULATIONS AND EXPERIENTIAL ACTIVITIES:
http://www.thetrainingclinic.com/books/bookhead.htm