It's apparent while watching these shows, that the "cold reading" technique is often used. Like most people, I want very much to believe.
I have read several articles in which claim John Edward is a fraud. He is said to have used numerous ploys including the planting of microphones in the auditorium in order to pick up conversation among audience members and having aides who gather data by having guests fill out cards with their name, address and other personal information.
http://www.csicop.org/si/2001-11/i-files.html
http://www.skeptic.com/newsworthy13.html
http://www.salon.com/people/feature/...3/probability/
I still, however, feel that Sylvia Browne may be legitimate, as her method differs from most of the other psychics I've seen on TV. She just spits out lots of info - first and last names, places, events - and seemingly without the back and forth guessing games of cold reading.