I often come across interesting links related to my research and wanted to share some of them:
American Legacy magazine is one of my favorites. They like to publish articles about unsung African Americans.
The Dwyer Cultural Center celebrates Harlem.
Sources related to Chicago's African American history:
Mapping the Stacks: A Guide to Black Chicago's Hidden Archives
The Black Metropolis Research Consortium
Finally, an excellent organization, the Gilder Lehrman Institute of American History, promotes and supports United States history. I received a fellowship from this institution a few years ago to support my research at the Schomburg Center for Research in Black Culture.