Diane Haddad posts on Family Tree Magazine's weekly internet page: "I just got an email that Ancestry.com is offering free access to its collection of immigration and travel records through Labor Day."
The records include:
citizenship and naturalization records
and more. The records are free through midnight ET on Sept. 2, so if you have time over the weekend for searching, you'll need to sign up for a free Ancestry.com account if you don't already have one.