Answerbag

User-submitted questions and answers on any topic whatsoever. Answers are rated, so users can see which answers and users are trusted.
http://www.answerbag.com

Dr. Dave and Dr. Dee

Advice from M.D. and Ph.D. on health, family, relationships, etiquette, fashion, movies.
http://www.drdaveanddee.com/

Go Ask Alice

Question and answers on many topics, with a health focus. From Columbia University's Health Education Program, with a searchable database.
http://www.goaskalice.columbia.edu/

The Board of Wenches

A group of people who answer all non-trivial questions.
http://www.boardofwenches.com

Kids Help Phone

Provides help to children in Canada on a variety of issues, such as relationships, school, bullying, suicide, and abuse.
http://kidshelp.sympatico.ca/en/

Dr. Phil

Official site of Dr. Phil McGraw. Includes a biography, events and tour schedule, online tests, a newsletter and contact details.
http://www.drphil.com/