In an announcement Wednesday, Mountain View, Calif.-based Google Inc. said the pilot project is a "new showcase of multimedia overlays" to give Google Earth users information from key premium content providers. Users will initially be able to access information overlays from the U.S. National Park Service, Discovery Networks, the United Nations Environmental Program, the Jane Goodall Institute and Turn Here, an online city guide service.

"We are excited to provide users with the opportunity to learn more about the natural wonders and manmade landmarks of the world with Featured Content for Google Earth," John Hanke, director of Google Earth and Maps, said in a statement. "We believe Google Earth is an excellent medium for organizing and sharing the world's geographic information and we continue to explore opportunities to bring visually compelling and informative content into Google Earth."

Users can access the new features by clicking on the "Featured Content" checkbox in the Google Earth sidebar after downloading and installing the free Google Earth application. Current Google Earth users will be able to access the new features without having to update their application.

Once a user clicks on a featured content vendor, markers will appear on the images being viewed, designating the special features. The featured content options will likely be changed periodically to showcase new offerings, according to the company, though some of the newer content sources may become regular features if they prove popular.

The new content providers, and the special features they offer, include: