General Research Sites
Ancestry is the most comprehensive site for documents (census, immigration, birth, marriage, death, military records) is www.ancestry.com. It is a paid site with an annual subscription fee.
Cyndi's List is a comprehensive, categorized & cross-referenced list of links that point you to genealogical research sites online.
FamilySearch, sponsored by the Church of the Latter Say Saints (Mormons) is the largest genealogy organization in the world. Millions of people use FamilySearch records, resources, and services to learn more about their family history. For over 100 years, FamilySearch has been actively gathering, preserving, and sharing genealogical records worldwide.
Heritage Quest Online contains census data, family records, and local histories. Many public libraries offer this database either in the library or online for its members.
The GenWeb project is a group of volunteers working together to provide free genealogy websites for genealogical research in every county and every state of the United States. This Project is non-commercial and fully committed to free genealogy access for everyone.
World level
Counties – click on the United States and find the state and county
Rootsweb - The primary purpose and function of RootsWeb.com is to connect people so that they can help each other and share genealogical research. Most resources on RootsWeb.com are designed to facilitate such connections. Rootsweb contains message boards, mailing lists by topic or surname, Social Security Death Index (SSDI) and searchable family trees posted at the World Connect project site. Although part of the ancestry.com community, its databases and services are free.
Sites with Irish Data
A Government of Ireland supported site with church records (births, marriages and deaths) and 1901/1911 census records online
A Little Bit of Ireland
For buying documents in various countries quickly
This County Limerick site has links to all Irish Counties but actual documents must be purchased.
County Clare genealogy
County Kerry site
Tithe records for some of Co. Cork
Burial records for County Kerry
Irish Archives – its free to use - provides links to other Irish research sites
Immigration records
New York City Castle Garden – 1820-1892 - Not currently active.
New York City Ellis Island, starting in 1892
Newspapers
University of Pennsylvania maintains a list of newspapers that have been digitized and are available online.
Other useful sites
Stephan P. Morse one step search engine. Immigration and census data are accessed with a simple search engine.
Canada Library and Archives
Canadian Census 1901 and 1911 Some earlier years available at ancestry.com - see above
CousinConnect is a small scale message board for surnames.
English searches
New York obituaries
New York City – birth, marriage and death records