The Library of Congress recently rolled out a new research tool in conjunction with their wonderful Chronicling America tool: Newspaper Navigator.
On the landing page for Newspaper Navigator is a great introduction video from LOC Innovator in Residence Benjamin Lee.
Here is a post from LOC that details how Newspaper Navigator came to be and how they envision this resource being a helpful research tool:
Newspaper Navigator allows users to search for visual data across newspapers from 1789-1963. This will certainly become a resource used by those doing family histories, as well as deeper historical research in general.
Jeff, South Park