Land Records

 Bureau of Land Management

http://www.glorecords.blm.gov/

Genealogical Societies

    Austin Family Assoc

http://www.afaoa.org

CGSL
http://californiaancestors.org

Crandall Family Assoc
http://www.cfa.net/cfa/contents.html

FGS
http://www.fgs.org

German Genealogy Group
http://www.germangenealogygroup.com

GSG
http://www.genealogicalspeakersguild.org

Huguenot Hist Society
http://www.huguenotstreet.org

ISGS
http://www.rootsweb.ancestry.com/~ilsgs/

NEHGS
http://www.newenglandancestors.org

NGS
http://www.ngsgenealogy.org

SCGS
http://www.scgsgenealogy.com

Schenectady Hist Society
http://www.schist.org

Society Hill
http://www.daddezio.com/society/

State Historical Societies
http://www.stenseth.org/us/statehs.html

City Directories

 City Directories of the US

http://www.uscitydirectories.com/

Eve & Don City Directories
http://www.donslist.net/PGHLookups/DirM.htm 

Online Historical Directories
https://sites.google.com/site/onlinedirectorysite/Home

Census

 Census Finder

http://www.censusfinder.com/index.htm

Cemeteries and Death Records

    Ancestors at Rest

http://ancestorsatrest.com/

Find A Grave
http://www.findagrave.com

Internment
http://www.interment.net

Obit Daily Times
http://obits.rootsweb.ancestry.com/cgi-bin/obit.cgi

Obits Links
http://www.obitlinkspage.com

Online Searchable Death Index
http://www.deathindexes.com

SSDI
http://search.ancestry.com/search/db.aspx?dbid=3693

Tributes
http://www.tributes.com

US Military Grave Locator
http://gravelocator.cem.va.gov/j2ee/servlet/NGL_v1

Calculators and Tools

 Atlas Hist County Boundaries

http://publications.newberry.org/ahcbp/

Birth Date Calculators
http://www.cyndislist.com/births.htm#Birthdate

Calendar Converters
http://www.cyndislist.com/calendar.htm#Converters

Cousin & Relationships
http://www.cyndislist.com/cousins.htm#Charts

Geographical Names
http://geonames.usgs.gov/

Inflation Calculator
http://www.westegg.com/inflation/

US Dollar Historical Value
http://www.measuringworth.com/uscompare/

Weather History
http://www.weatherbase.com

Wolfram|Alpha
http://www.wolframalpha.com 

Books and Libraries

    250 Killer Archives

http://oedb.org/library/features/250-plus-killer-digital-libraries-and-archives

Allen County Public Library
http://www.genealogycenter.org

Ancestry Card Catalog
http://www.ancestry.com/search/rectype/alldblist.aspx

Family Search Books
http://www.lib.byu.edu/fhc/index.php

Google Books
http://books.google.com

Hathi Trust
http://www.hathitrust.org

Internet Archive Texts
http://www.archive.org/details/texts

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

Library of Congress
http://www.loc.gov/index.html

Newberry Library
http://www.newberry.org

Open Library
http://openlibrary.org

PERSI
http://search.findmypast.com/search/periodical-source-index 

The Online Books Page
http://onlinebooks.library.upenn.edu/archives.html

WorldCat 
http://www.worldcat.org