e-Government, IEEE Computer Society Technical Community on
IEEE interest group, apparently open to non-members as well.
ICMA
Technology information from the International County/City Management Association: articles, blog posts, and more. Go to icma.org and do a site search on "technology."
Code for America
Volunteer group bringing technology to the business of government. Coders build apps and use existing government data in innovative ways for public service.
U.S. Digital Service
Coders in the Office of the President.