TranceNet

Meditation Information Network (don't miss the TM-EX Newsletter Archive)

Behind the TM Facade (specializes in very effectively debunking TM's claims to "scientific validation")

International Cultic Studies Association (you may wish to start with "Cults 101").

TranceNet

Cult Awareness & Information Centre

Steven Hassan's Resource Center for Freedom of Mind

FactNet

Chapter 3 from Trance and Treatment, Clinical Uses of Hypnosis (note the reference to "Transcendental Meditation" and the "relaxation response" which is a sort of "secularized TM").

Here is an About.com article on hypnosis

Here is the Psych Web FAQ on hypnosis.

The best single book to start with is Combatting Cult Mind Control by Steven Hassan.  This book is an excellent popular introduction to the psychological techniques used by "destructive cults" to surreptitiously alter the worldviews of their recruits.   

Another excellent book is Cults in Our Midst by Margaret Thaler Singer, Janja Lalich, and Robert Jay Lifton.  Dr. Margaret Singer is emeritus Professor of Psychology at the University of California at Berkeley, and is one of the foremost contributors to the understanding of the psychological influence techniques used by "destructive cults" in order to recruit and retain members. 

I also suggest reading TM and Cult Mania by Michael A. Persinger et al.  Dr. Persinger is Coordinator of the Behavioural Neuroscience Program at Laurentian University. This book provides a thorough treatment of the "TM as trance and suggestion" theory.

TM.org

AllTM.org

There is an Internet "newsgroup" (or "online discussion forum") called "alt.meditation.transcendental".  The topic of discussion is TM and associated subjects.  It gets pretty hairy there sometimes, but you may find it interesting.

If you have, and know how to operate, "newsreader" software then you can access alt.meditation.transcendental directly via newsreader.  Or, you can also access it via web browser.