Most books about genealogy and doing genealogical research are in the CS section. General books on researching Jewish genealogy are in the CS 21 section. Books on Jews from specific countries or regions are in CS 41-2209. To research the origins or meanings of family names (or baby names!) look in the CS 2300-3090.
To find books in the catalog do a subject browse search under Genealogy
"The International Association of Jewish Genealogical Societies (IAJGS) is an independent non-profit umbrella organization coordinating the activities and annual conference of more than 70 national and local Jewish Genealogical Societies (JGS) around the world." Its resource page includes to links for many useful sites.
This site includes a history of Jews in Italy, census lists, Jewish family heraldry, and name database.
This excellent sites hosts a variety of helpful genealogical tools including discussion groups; the Family Finder (connecting to other people researching the same family names) the Town Finder; databases for many countries and regions which include city, provincial, and nationals records; Holocaust databases; burial & cemetery records; and Kehilah links (hosted sites devoted to particular towns).
This site has many articles, research hints, and searchable databases on Sephardic Jewry and genealogy.
This project of United States Holocasut Memorial Musium includes millions of documents containing details about victims of the Holocaust and Nazi persecution during World War II. This is a free searchable database hosted by Ancestry.com. Volunteers may also participate by keying in records to add to the database.
Hundreds of Yizkor books are available in PDF format through this site.
Run by the Mormon Church, this site covers a huge amount of local and international resources in their databases.
"PolishRoots covers all areas that were historically part of the Polish Commonwealth, from the 16th through the 18th centuries, throughout the years of partitions by Prussia, Russia, and Austria, through its rebirth in 1918, subsequent domination during World War II and post-War occupation, to its present freedom and struggle for independence through the latter 20th Century."
This site includes several online exhibits on immigration to the United States as well as a searchable database of ship (and some aircraft!) manifests.
The goal of WorldGen is "to have every country in the world represented by an online website and hosted by researchers who either live in their own country or who are familiar with their country's resources."