American Immigration Home Page - put together by a 10th grade class http://www.bergen.org/AAST/Projects/Immigration/
Ellis Island On-Line : The immigrant experience http://www.ellisisland.org/Immexp/index.asp
Library of Congress - American Memory : This contains a lot of primary source material - use the "Search" feature. http://memory.loc.gov/
Tide of Emigration http://www-adm.pdx.edu/user/frinq/pluralst/tide.htm
We're studying about immigration ; page put together by a 5th grade class, includes a virtual tour of Ellis Island. http://www.geocities.com/lothropimmigration/