Check these sites:
The Homeopathy Homepage: http://www.homeopathyhome.com.
The homeoinfo -pages: http://www.homeoinfo.com/ pretty good. Check, for instance, the Materia Medica section on Common questions: "Contaminating pills by touching them".
Henriette's Herbal Homepage
Welcome to the bark side.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.