While it's still better to go to the library use the actual printed works, there are times when you don't have one handy and the libraries and stores are all closed. So, to that end, you can use any of these via the Web, too:

http://www.ancestornews.com/

www.ancestry.com

www.genealogy.com

www.rootsweb.com
 

Health

www.herbalsafety.utep.edu
look at the herbal fact sheet. you can find a fact sheet about many herbs

http://www.cia.gov/cia/publications/factbook/  CIA World Factbook.  A superb site
for information on countries including flags.

www.healthopedia.com/  Health information

www.infoplease.com/index.html  An almanac, encyclopedia, dictionary, and atlas!

www.inspire.net/  Indiana residents can search thousands of magazines for free!

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

www.m-w.com  Merriam Webster Dictionary

www.refdesk.com/homework.html  Ready Reference

www.thebeehive.org/school/default.asp  Free homework help

http://www.scifair.org/ The ultimate science fair resource 

Wikipedia, the Free Encyclopedia An excellent free encyclopedia resource

www.zen.org/~brendan/kids-homework.html
 

Miscellaneous Links

http://www.openoffice.org Open Office, a free productivity suite compatible with many MAJOR office suites

www.factcheck.org
This tells fact from fiction in the presidential debates and commercials. 
VP Dick Cheney even mentioned it in the debate this week.  He got the web
address wrong but still... good information for those who want to be in
the know.

Search Engines

www.dogpile.com Dogpile

www.google.com  Google

www.yahoo.com Yahoo