Aromatherapy
   Robert Todd Carroll on "aromatherapy", from the Skeptic's Dictionary. Article points out that most claims of efficacy are anectdotal, there is little "scientific evidence" to show the oils work.
   http://skepdic.com/aroma.html

Aromatherapy Debunked and Defended
   Anya McCoy loves essential oils and how they can heal the body and mind, but presents solid information debunking the con artists and fakery of the aromatherapy business.
   http://member.newsguy.com/~herblady/aroma.htm

Aromatherapy: Making Dollars out of Scents
   Stephen Barrett, M.D., on the aromatherapy business.
   http://www.quackwatch.org/01QuackeryRelatedTopics/aroma.html

Scents and Nonsense: Does Aromatherapy Stink?
   Article on aromatherapy from "Priorities", a publication of the American Council on Science and Health.
   http://www.acsh.org/publications/priorities/0904/aromatherapy.html

What's That I Smell?
   Examination of the claims of aromatherapy, published by the Skeptical Inquirer.
   http://www.csicop.org/si/9605/aroma.html