Flying in the face of chemistry and physics, homeopathic products are still very much in use today. Randi takes a few moments to explain the principles and ridiculousness of homeopathy during a lecture in Richardson Auditorium at Princeton University in 2001.
(edit: There are comments relating to the difference between Homeopathy and Herbology; health food stores can blur these very distinct alternative medicine systems by presenting the compounds side-by-side. However...
"In herbology, measurable amounts are used, while in homeopathy the active ingredient is diluted until it is no longer detectable, or do not contain any of the original active ingredient at all (when the dilution exceeds the Avogadro's number)." http://en.wikipedia.org/wiki/Homeopathy
On top of this, 'homeopathy' is a well established and sciencey-sounding term, so there are also treatments available that do not follow homeopathy but are free to market themselves as such on the label.)