WHO sites

International Clinical Trials Registry Platform

Clinical trials registries

ISCTRN (Current Controlled Trials)
Japan (University Hospital Medical Information Network - UMIN)
NIH-ClinicalTrials.gov
Open Archives Initiative
The National Research Register (UK)
TrialsCentral

Journals

British Medical Journal (BMJ)
International Committee of Medical Journal Editors (ICMJE)
Journal of the American Medical Association (JAMA)
Lancet
New England Journal of Medicine

Web Sites Related to Clinical Trials

Cochrane Collaboration
European & Developing Countries Clinical Trials Partnership (EDCTP)

Pharmaceutical companies and related associations

Eli Lilly
Forest Labs
GlaxoSmithKline
IFPMA
Merck
Novartis
The Japan Pharmaceutical Manufacturers Association (JPMA)
PhRMA