University of California, Berkeley
http://igs.berkeley.edu/library/status-of-government-websites-during-shutdown
United States Census Bureau on Internet Archive
http://web.archive.org/web/20130928074925/http://www.census.gov/
Leonard Library
San Francisco State University Library
http://libguides.sfsu.edu/governmentshutdown
Knowledge Center
http://knowledgecenter.csg.org/drupal/content/expert-information-shutdown
Eastern Michigan University Library
http://guides.emich.edu/content.php?pid=126801&sid=1103855
got any others?