Local academic groups
HKS Program on Science, Technology & Society – Events
HKS Program on Science, Technology & Society – Courses and Secondary Field
Division of Medical Science Policy & Non-Profit Path
STP Crossroads Consortium
MIT Science Policy Initiative

Other organizations
Union of Concerned Scientists
Scientists and Engineers for America

Blogs
Discover Magazine blog: Policy Fellowships For Scientists & Engineers
NEWScience Policy blog
ScienceInsider (Science magazine policy blog)
White House Office of Science and Technology Policy blog

Articles
Want Change? Call Your Representative. Ilya Fiscchoff, AGU/AAAS Congressional Science Fellow. Published in Eos (Membership newsletter of the Americal Geophysical Union),  Vol. 92, No. 30, 26 July 2011
Political Science: the practice of science cannot be, nor should it be, entirely apolitical. 2012. Nature, 483, 123-124.

Opportunities

List of science and technology policy fellowships
Another compilation of fellowships