Immigration

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.
http://www.ellisisland.org/

Firstmom's Genealogy Resource: Immigrant Ships
Transcription of several passenger lists, primarily mid- to late 1800's.
http://members.tripod.com/~KHuish/ships.htm/

The Immigrant Ships Transcribers Guild
Firm that searches, copies, deciphers, and types passenger lists. Some passenger manifests posted on the web, from RootsWeb.
http://www.immigrantships.net/

Migrations
Volunteer project with links to migration information and a searchable database that collects and analyzes migration data.
http://www.migrations.org/

National Archives and Records Administration
Information on ship passenger arrival records held by NARA and how to access the records for genealogical research.
http://www.archives.gov/genealogy/immigration/