Active Training - www.activetraining.com. This website includes training ideas, tips, and suggestions from Mel Silberman, as well as a list of available resource materials.
Bob Pike Group - www.bobpikegroup.com. This website features resources, seminars, and other tools for trainers, including articles on such topics as Dealing with Difficult Participants and 19 Ways to Help Transfer Training.
Jossey-Bass Publishers - www.josseybass.com. This website includes a variety of books, VHS tapes, and other trainer resources under the heading General Education.