From their press release:
JSAH Online offers access to JSAH from the first volume published in 1941 through the present. The current issues provide leading research articles and reviews about the built environment accompanied by extensive multimedia content including images, videos, and GIS-driven visualizations.
JSAH Online is the first online journal devoted to the arts and humanities that incorporates cutting-edge multimedia features and heralds the launch of the next generation of scholarly communication. Such features in the inaugural issue include recreated music from an ancient Roman funeral, a zoomable image of a 37-foot-long Panorama of Constantinople from 1559, and a 3D model of the Roman Forum and environs overlaid on a Google Earth map.
Unfortunately it will only be open to SAH members in 2010, and after that only to subscribers to the JSTOR platform.