Here is fun project at the blog Indulgence & Sin: A Historian's Craft.
Blogger and grad student Rachel Leow has a copy of Marco Polo's Travels, and an internet connection and she is not afraid to use them. The result is a fun use of Google Maps, an illustrated journey of Marco Polo with photographs and illustrations pulled off the web and links to relevant websites for many of the places mentioned by the explorer. Here is a direct link to her full scale Google map.
This approach has a lot of potential, especially for teachers. So many history topics could be explored geographically--exploration, famous journeys, wars and battles, historic trails, historic sites in a community. Google Maps offers a way to have students work on a collaborative project that is much greater than the sum of its parts.