via the Detroit Area Libraries Network:
From the WSULS News Blog: “Because of a six month extension to an Institute of Library and Museum Services grant, the Wayne State University Library System and the Walter P. Reuther Library just finished adding around 20,000 images and over 400 videos to the Virtual Motor City photo collection, an online resource already containing digitized images from the Detroit News Collection, a photojournalistic resource held at the Reuther Library.
This is the first time that videos were digitized as part of the VMC Project. The new videos added are Detroit News newsreels from the 1920s and include footage from local people and events to more well-known subjects like Babe Ruth and Helen Keller. The videos can be browsed at http://www.lib.wayne.edu/resources/digital_library/det_news/
There’s a remarkable collection of stuff here, though finding things in it is going to be a challenge at first – aside from a small amount of descriptive text per item, the collection is largely unindexed yet. Some highlights include the opening of the Detroit Institute of Arts, a 1922 parade of old cars, and the 1925 Detroit News bread-baking contest.
Edward Vielmetti's Wordpress weblog 
This is excellent — reminds me of the efforts of Rick Prelinger and the Prelinger archive. Their stuff is indexed:
http://icanhaz.com/prelinger
http://icanhaz.com/detroitMI
The Detroit HIstorical Society has an exhibit running:
http://www.detroithistorical.org/exhibits/index.asp?MID=1&EID=502
September 8, 2007 – August 2008
In the 1920s, Detroit reigned as the automotive capital of the world and set the pace for American prosperity. As automobiles rolled out and money rolled in, Detroit’s new aristocracy lavished their fortunes on the cityscape, building one of the greatest collections of urban architecture in North America. “1920s: Detroit’s Building Boom” reflects on how the decade forever shaped the city, marveling at several kinds of architecture of the period. Divided into sections on infrastructure, culture, skyscrapers, residential, community service and industry, the exhibit will feature structures ranging from the Ambassador Bridge (1929) and the Fisher Building (1928) to the Book-Cadillac Hotel (1923) and the Fox Theatre (1928).