One of my favorites Labelscar, is devoted specifically to the North American mall that are in most cases dimming from the landscape into extinction. Jason Damas and Ross Schendel mostly provide images taken on their own journeys, often returning to the scene of the crime to access the results over the years. As informative as the posts are the extensive comments which in some cases get quite nostalgic and others political.
Similarly, Nicholas Dimaio has penned The Caldor Rainbow, which focuses on an extinct big box chain that primarily had locations throughout the Northeast and died in 1999. Nicholas also mostly posts from his own excursions to find the remnants of this forgotten brand.
Possibly the most extensive and wonderful example of the historical retail archive blog is Pleasant Family Shopping. A website created by Dave Aldrich which scours countless physical archives of library microfiche, old trade magazines, company annual reports, etc. Dave brings to light not only a spectacular archive but a historical perspective that track the sometimes subtle and sometimes dramatic evolutions of retail giants and others whom have disappeared into the ether.
There is countless others whom simply dedicate their curiosity and obsessions to the traditional camera sense of documenting spaces simply to share through flickr or blogs.
2 wonderful dead retail flickr groups:
Enjoy the retail wormhole.