Vanderbilt has compiled a list of frequently used federal online resources in the health sciences affected by the government shutdown, including AHRQ, CDC, NCBI databases and PubMed. These resources are working, but will not be updated until funding is enacted.
In addition, the following sites are unavailable during the shutdown:
http://eric.ed.gov/ (ERIC will still work in Ebsco but full text access may be affected)
National Archives http://www.archives.gov/
Library of Congress http://www.loc.gov/
More info here: http://alisha764.com/2013/09/30/potential-government-shut-down-leaves-librarians-scrambling-for-information/