One new web site is dedicated to bringing the history of Dayton, Ohio to the web. Dayton History Books Online is available to everyone at no charge.
The stated mission of Dayton History Books Online is "to make books and other materials about Dayton available to children and the general public in a format that can easily be read and searched, for use in homework and personal projects. Through the collaboration of local libraries, universities, archives, businesses and individuals, we hope is to create online the most complete collection of Dayton local histories possible."
I took a quick look at the list of books already available and found:
The Backgrounds of Early Dayton History
by Professor W. B. Werthner Copyright 1928
The Bench and Bar of Dayton
by Hon. Lewis B. Gunkel Copyright 1900
Boyer's, the Circus & Other Historical Reminiscences
by Chip Boyer Copyright 2003 All Rights Reserved
A Boy's Impression of Dayton 64 Years Ago
by Michael Ohmer Copyright 1901
Dayton From the Air
by Walter Wyatt Snypp Copyright 1923
Education of Girls in Dayton Cooper Seminary
Author unknown Published 1911
And much more. The above is just an excerpt to show the sort of material found on the site; a much longer list is available.
This site has only been online for about two months but already has a lot of information available. If your ancestors lived in Dayton, you will want to keep an eye on Dayton History Books Online.