AskERIC
http://www.eduref.org/Virtual/Qa/archives/

Hennepin County Library
http://www.hclib.org/pub/search/fff_public.html

Keystone Library Network
http://libweb.mnsfld.edu/vid/vid-kb.asp

Santa Cruz Public Libraries
http://www.santacruzpl.org/cgi-bin/readyref.pl

Straight Dope by Cecil Adams
http://www.straightdope.com/columns/index.html

Stumpers-L
http://www.regiments.org/wombats/stumpers.htm

Ask Dr. Math
http://mathforum.org/mathgrepform.html

MIT: START AI for Geography and Artificial Intelligence
http://www.ai.mit.edu/projects/infolab/globe.html

Mad Scientist Archives
http://www.madsci.org/MS_search.html

Austin Public Library
http://www.ci.austin.tx.us/library/ff_intro.htm

Internet Public Library
http://www.ipl.org/div/farq/

Library Spot
http://www.libraryspot.com/ask/