Phytotherapies.org MONOGRAPHS:
http://www.phytotherapies.org/monograph_index.cfm

Sloan Ketterling MONOGRAPHS About Herbs
http://www.mskcc.org/mskcc/html/11571.cfm?herbsaccept=yes

The Drug Database, a great resource re prescription drugs, with some data on herbs also:
http://www.thedrugdatabase.com/directory

Drugs.com MONOGRAPHS [mainly prescription drugs, but some herbal data also]: http://www.drugs.com

Jim Duke's Phytochemical and Ethnobotanical Databases: Ethnobotany query
http://www.ars-grin.gov/duke/ethnobot.html

Herb research foundation
http://www.herbs.org/

Fitovigilanza
http://www.farmacovigilanza.org/fitovigilanza/index.htm

Internationale herb association
http://www.iherb.org/

Natural1
http://www.natural1.it/ita/index.asp

Centro Nazionale di Epidemiologia Sorveglianza Salute
http://www.epicentro.iss.it/

Università di Chieti Corso di Medicina Biointegrata
http://www.medicinabiointegrata.it/

Sito Medico Scientifico del Dott.PANSINI Alfredo Dionisio
http://www.mednaturalia.net/

Farmacisti del territorio

 http://www.farmacistadelterritorio.it

http://digilander.libero.it/fitoamici/

http://www.phytosonline.it/

http://www.dsalud.com/fitoterapia.htm

http://www.herbworld.com/

http://www.fitoterapia.net/

http://www.erbe.it/