National Archives and Records Administration - http://www.archives.gov/genealogy/immigration/ Information on ship passenger arrival records held by NARA and how to access the records for genealogical research.
Migrations - http://www.migrations.org/ Volunteer project with links to migration information and a searchable database that collects and analyzes migration data.
The Immigrant Ships Transcribers Guild - http://www.immigrantships.net/ Firm that searches, copies, deciphers, and types passenger lists. Some passenger manifests posted on the web, from RootsWeb.
American Family Immigration History Center - http://www.ellisisland.org/ 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.
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