Mikael Jacobsen writes in the Library Journal (16/10/08) "Librarians use online mapping services such as Google Maps, MapQuest, Yahoo Maps and others to check traffic conditions, find local businesses, and provide directions. However, few libraries are using one of Google Maps most outstanding applications, My Maps, for the creation of enhanced and interactive multimedia maps. My Maps is a simple and free means of adding valuable content to any library web site." Article tells about innovative uses of My Maps at Franklin County Public Library.
Thre is also an interesting screencast tutorial.