This webpage is from the folks behind geocommons finder and maker. I like this economy dashboard because it is simple and it appears to have up-to-date information (as of March 2009). The other nice aspect about geocommons in general is the access to the tabular data, and also to shapefile format for use in GIS.
The Spatial History Project at Stanford University, a part of the Bill Lane Center for the Study of the North American West, is made possible by the generous funding of the Andrew W. Mellon Foundation.