The American Chemical Society has a Career Navigator website:
http://www.acs.org/content/acs/en/careers.html
and the C&EN Jobs site:
http://chemistryjobs.acs.org/jobs

Joel Walker maintains The Medicinal Chemistry Jobs List.

New Scientist hosts the ChemJobs website:
http://www.chemjobs.net

LinkedIn has jobs:
https://www.linkedin.com/jobs/

Alzheimer's Association

Alzheimer's Drug Discovery Foundation

American Diabetes Foundation

American Heart Association

CHDI

Chemical Heritage Foundation

Crohn's and Colitis Foundation of America

Gates Foundation

Howard Hughes Medical Institute

Leukemia and Lymphoma Society

Massachusetts Biotechnology Council

Mayo Clinic

Michael J. Fox Foundation

Muscular Dystrophy Assocation

National Kidney Foundation

National Multiple Sclerosis Society

Oklahoma Medical Research Foundation

Parkinson's Disease Foundation

RWJF