Many researchers have used the very detailed Sanborn Fire Insurance maps; the Michigan State University Library has compiled a list of links to repositories that have scanned portions of the maps. (Note that a large collection is available through ProQuest for a fee or university access; the MSU list generally refers to freely accessible sites.)
Another report from Mark Boonschoft on the Early American Manuscripts digitization project at the New York Public Library--all of interest to business historians.
A review from The Guardian of an exhibit at the Folger Shakespeare Library in Washington, DC, "America's Shakespeare." David Smith talks with curator Georgianna Ziegler about Shakespeare and the American advertising industry.
Two pieces of interest by Emma Hart of the University of St. Andrews: on the Global Urban History blog she writes about "Vicissitudes of Globality: The Many Connections of Eighteenth-Century Charleston"; for the Omohundro Institute blog, she considers "The 'Offal' Difficulties of Writing Readable Economic History."
Via Slate's Vault, digitized maps of Chinese businesses in late 19th-century San Francisco
Also in Slate, Rebecca Onion offers a round-up of digitized materials from the black press; she particularly focuses on Black Quotidian: Everyday History in African-American Newspapers, curated by Matt Delmont.
The "Imagining Markets" project's third workshop was held at the University of Cambridge on April 7, 2016. The program, with abstracts of the papers, is available on the project website.
Forbes has published a discussion of Laura Phillips Sawyer's work on Edna Gleason, who became known as the “mother of fair trade” in the late 1920s.
As many readers know, Stephen Mihm writes regularly for the Bloomberg view. His posts are available from this link.
Heidi Tworek writes, with Gabriel Pizzorno, about the History Lab project at Harvard University in the April issue of AHA Perspectives.
Tworek also helped organize and participated this spring in a conference, "Communicating International Organisations in the 19th and 20th Centuries," at the European University Institute; Richard R. John spoke at this conference as well.
Also from AHA Perspectives, "History on the Download: Podcasting the Past," which discusses some well-regarded ventures, including "Who Makes Cents? A History of Capitalism Podcast."
Georgia Tech and the University of Georgia have created a US News Map that allows users to search the texts in the "Chronicling America: Historic American Newspapers" project and visualize the results across space and time. Very easy to use, but users should be aware that the "Chronicling America" project has many gaps in coverage, so that results can't be viewed as definitive--but they are useful visualizations. An overview is provided by a Slate article on the News Map project.