Recently, I found the following articles regarding historical directories:
- Chicago City Directories on Archive.org by Michael John Neill at Search Tip of the Day
- Direct Me NYC 1786: A History of City Directories in the United States and New York City by Philip Sutton at New York Public Library blog
For pages on my site related to the above articles, visit the Cook County, Illinois Online Historical Directories page and the New York City, New York Online Historical Directories page.
Jean Wilcox Hibben will be presenting a free webinar for the Illinois State Genealogical Society on May 12th titled "Need Direction? Try City Directories!" For more information, see this link. Here's a tutorial on how to access webinars.