American Family Immigration History Center:Searchable database arrivals at Ellis Island in New York harbor between 1892 and 1924, plus information on the Wall of Honor, membership and visiting Ellis Island.
American Immigration: Comprehensive informational resource on immigration.
Firstmom's Genealogy Resource: Immigrant Ships: Transcription of several passenger lists, primarily mid- to late 1800's.
Migrations: Volunteer project with links to migration information and a searchable database that collects and analyzes migration data.
National Archives and Records Administration: Information on ship passenger arrival records held by NARA and how to access the records for genealogical research.
The Immigrant Ships Transcribers Guild: Firm that searches, copies, deciphers, and types passenger lists. Some passenger manifests posted on the web, from RootsWeb.