African American Newspapers Forum
Online Historical Newspapers Website
This site also came from my attendance of the webinar by Pamela Weisberger on newspaper research hosted by the Southern California Genealogical Society (SCGS) in November.
My initial assessment of the site shows the majority of the listed newspapers as coming from either GenealogyBank or Chronicling America, both of which are represented on Kenneth Marks' great site The Ancestor Hunt. But there are unique ones here and there, such as those provided for free by the Minster Historical Society and Museum in Ohio.