See the above page for the full list of OI resources, most of which are focused on Egypt, with thanks to Chuck Jones for yet again for indexing them and to the OI for making them available.
The Oriental Institute of The University of Chicago is a leader in open access publishing of scholarly work on the Ancient World. In 2009 they published some 114 titles online, many of which are long out of print, rare, and hard to find. These are listed below in the order in which they appeared online, earliest at the top. The Electronic Publications Initiative of the Oriental Institute of the University of Chicago outlines the forward thinking policies which guide this effort.
For an up to date list of all Oriental Institute publications available online see AWOL - The Ancient World Online - 2: The Oriental Institute Electronic Publications Initiative. All told, nearly two hundred fifty volumes are now accessible.