"Looking for a fresh way to create rich educational presentations? Meograph helps users create and share uniquely dynamic interactive projects, incorporating Google Maps and Google Earth to generate a story time line, which can be enhanced with images, video clips, text, audio narration, and links for more in-depth information."
This is in Beta release, but you may sign up for an account. Currently it only works in Chrome but they say that versions for Firefox and Safari will be available.
Via Beth Dichter