The Atlas of Early Printing

The University of Iowa Libraries has an interesting site highlighting 15th century printing.

From the site...

The Atlas of Early Printing is an interactive site designed to be used as a tool for teaching the early history of printing in Europe during the second half of the fifteenth century. While printing in Asia pre-dates European activity by several hundred years, the rapid expansion of the trade following the discovery of printing in Mainz, Germany around the middle of the fifteenth century is a topic of great importance to the history of European civilization.