Organizations:

AMIA - American Medical Informatics Association
IMIA - International Medical Informatics Association
International Society for Computational Biology
MLS - Medical Library Association
The Medical Records Institute
NCBI - National Center for Biotechnology Information
NLM- The National Library of Medicine
Society for Medical Decision Making (SMDM)

Journals:

Artificial Intelligence in Medicine
Bulletin of the Medical Library Association
International Journal of Medical Informatics
JAMIA, The Journal of the American Medical Informatics Association
Methods of Information in Medicine