Today's free genealogy resource comes courtesy of Ancestry.com. Normally, I wouldn't promote a paid site, but Ancestry is offering free access to their US Immigration Database from now through Labor Day. You do have to register with the site, but it's free.
The Immigration Database includes passenger lists, naturalization records, border crossings and passport data and other immigration data. The other data may include published records, registers and other immigrant-related records. One newly added feature you will want to check out is the Ellis Island Oral History Collection, a compilation of over 1700 recorded oral histories by immigrants.
This is really a great opportunity to trace ancestors that emigrated to the United States. The Ellis Island Oral History Collection will remain free even after the free weekend access concludes. For more information, you can check out the press release here.