As somebody who cherishes his Illinois and California WPA guides, it’s hard to argue with David Kipen‘s plea to revive them online:
I’m calling for the creation of a free, route-based, readily searchable online repository of all the text and photography from every last American Guide, with the Center for the Book’s literary maps to all 50 states thrown in for good measure. Copyright law here should prove less of a headache than usual, considering that the American taxpayer already paid for this priceless treasure house a lifetime ago.
The WPA guides, somewhat famously, helped support many writers during the Great Depression, including Ralph Ellison, Zora Neale Hurston, Nelson Algren, Eudora Welty, and more. (A 2003 New York Times piece captures the breadth of the contributions.)
markathitakis.com 
I’m actually considering an online project that does just this for the Pennsylvania guide as part of my master’s degree project/thesis. See:
http://brixius.wordpress.com/2007/05/09/guide-to-the-keystone-state/