http://www.drinet.org/
The Diabetes Research Institute is an organization whose mission is to develop the DRInet to optimize information transfer in the field of diabetes, including islet transplantation.

http://www.idsoc.org/
The Immunology of Diabetes Society is an international collaborative initiative set up to advance research related to the etiology, pathogenesis, prevention and cure of type 1 diabetes.

BioCritique
BioCritique helps you stay on top of significant advances in biomedical research.
Leading scientists and clinicians in the areas of cardiovascular disease, diabetes, endocrinology and mental health select and review the latest 'impact' articles on an ongoing basis.
Go to this link for diabetes specific reviews:
http://www.biocritique.com/external_diabetes.cfm