FamilySearch recently issued this announcement:
North American Indexing Volunteers Invited to Join New US Immigration & Naturalization Community Project
More than 160,000 volunteer indexers made the 1940 U.S. Census available for searching in just five months. The project was an unprecedented success that dramatically illustrated what the genealogical community can accomplish when united in a common cause.
Now many volunteers are turning their attention to the U.S. Immigration & Naturalization Community Project, an indexing effort to make passenger lists, naturalization records, and other immigration related records freely searchable online. Hundreds of thousands of North American volunteers are expected to contribute over the next 18-24 months, focusing initially on passenger lists from the major US ports.
Individuals, societies and other groups that want to participate should visit familysearch.org/immigration to learn more.