Best Sites

http://www.jewishgen.org/ The Official Home of Jewish Genealogy
http://www.jewishgen.org/databases/cemetery/ (World Wide Burial Registration)
http://www.jewishgen.org/jri-pl/ (Jewish Records Poland)
http://www.stevemorse.org/ The best site for One Step search forms and information

http://www.cyndislist.com/ The best organized directory of over 236,050 genealogy sites.
http://www.cyndislist.com/jewish.htm Jewish Genealogy Section
http://www.pbclibrary.org/genealogy.htm Palm Beach County Library (Heritage Quest, Ancestry.com, etc.)
http://www.familysearch.org/ (Databases - TheChurch of Jesus Christ of Latter-day Saints) 

General Research

http://www.archives.gov/ US National Archives and Records Administration (NARA)
http://www.ancestry.com/ Fee based; free if accessed at Palm Beach County Library
www.avotaynu.com Current research books. Genealogy articles, newsletter etc.
http://www.acpl.lib.in.us/ Allen County Public Library, IN. Excellent source for mid-west genealogy
http://www.hias.org/ Hebrew Immigrant Aid Society
http://www.museumoffamilyhistory.com The Museum of Family History http://olivetreegenealogy.com/index.shtml Free databases for passenger lists, military records, etc
http://www.raogk.org/ Free research by Random Acts of Genealogical Kindness
http://www.routestoroots.com/ Miriam Weiner’s site for Jewish research in Poland, Ukraine, Moldova, etc. 

http://www.rootsweb.com Largest free genealogical research site
http://www.shoahconnect.org/

http://www.yadvashem.org/ Holocaust Memorial Site
http://www.yadvashem.org/wps/portal/ Data Base-Pages of Testimony
http://www.yivoinstitute.org/ Yivo Institute for Jewish Research

British–Dutch–South Africa Research

http://www.rootsweb.com/~websites/international/uk.html
http://worldgenweb.org/
http://freecen.rootsweb.com/ (Census data)
http://freereg.rootsweb.com/ (parish Registers)
http://www.genuki.org.uk/ (UK and Ireland genealogy)
http://freebmd.rootsweb.com/ (births, deaths, marriages)
http://www.dutch-jewry.org/
http://www.sagenealogy.co.za/

Passenger Lists

http://home.att.net/~wee-monster/ei.html Emigration-Immigration Records & Links
http://immigrantships.net/index.html 1820-1940s arrival at US Ports from Europe
http://www.schiffslisten.de/index_en.html Bremen Passenger Lists 1920-1939

New York Research

http://www.archives.gov/northeast/nyc/new_york.html Regional site of National Archives
http://www.forgotten-ny.com/  Images and info of NY from years ago
http://www.italiangen.org Surname Database , NYC Death Index; Groom Index and more
http://www.bklyn-genealogy-info.com Brooklyn data bases.
http://www.brooklynpubliclibrary.org/eagle/ Brooklyn Daily Eagle 1841-1902
http://www.jgsny.org/ Jewish Genealogical Society NY

Sephardic Research

http:// www.sephardim.com/
http://www.sephardicgen.com/

Search Engines & Look-Ups

http://www.google.com/
http://directory.google.com/Top/Society/Genealogy/Religions/Jewish/
http://www.ask.com
http://www.anywho.com
http://www.switchboard.com
http://www.411.com/

Other Lists

http://jewishwebindex.com Free compendium of thousands of links of information
http://www.cjh.org Center for Jewish History (see Fact Sheets)

Miscellaneous

http://www.onlinenewspapers.com/
http://www.350th.org/ 350 years of American Jewish History

Maps

http://maps.google.com/
http://maps.live.com/
http://www.mapblast.com/
http://maps.yahoo.com/
http://www.fallingrain.com/world/
http://www.multimap.com/
http://www.lib.berkeley.edu/EART/x-ussr/ukraine.html (Ukraine)

Blogs and Newsletters

http://tracingthetribe.blogspot.com/  Tracing the Tribe: The Jewish Genealogy Blog
http://blog.eogn.com/eastmans_online_genealogy/ Eastman's Online Genealogy Newsletter
http://www.avotaynu.com/nuwhatsnew.htm "Nu? What's New?" The E-zine of Jewish Genealogy