Here are some sites I find helpful when searching for genealogy data.

This site is really great to start a search for surnames and it contains other links inside.

http://www.all-surnames.com

http://familyhistory.com/messages/messages.asp?…

http://www.lineages.com/queries/search.asp

http://www.gentree.com/

 http://www.rootsweb.com/

http://www.usgenweb.org/

 http://www.census.gov/

http://sunsite.utk.edu/civil-war/

http://www.usgenweb.org/

http://www.fcrosby.com/genealogy

http://www.familysearch.org/

http://www.genealogy.org/

http://bingcrosby.com/bing/

http://www.stevenlewis.info/crosby/disco.htm

http://www.ancestry.com/

http://genforum.genealogy.com/crosby/all.html

http://mormon.org/family-history?

https://www.familysearch.org/learn/wiki/en/Indexing_Project_Page