We have a trial to Local & Regional History Online from Alexander Street Press thru 8/16/09.  The publisher describes it as follows:

Local and Regional History Online: A History of American Life in Images in Texts presents the everyday people, places, and events that have shaped American history and culture. The collection, drawn from Arcadia Publishing’s award-winning line of local history books, features images and texts assembled by thousands of local experts with unparalleled knowledge of their community’s history. Individually, each title represents a small slice of American history; collectively, they offer a massive tapestry documenting every aspect of the American Story.

Local and Regional History Online is continually updated with more and more titles, and will grow to include more than 500,000 pages and 1 million images. Currently, the collection contains approximately 100,000 pages and 175,000 images, all indexed to allow for easy browsing and searching across contents.

Once you have tried it out please be sure to let us know what you think!