In fear of extremist groups, the Indian government is requesting that Google reduce the detail of several sensitive sites, such as military bases and government buildings, viewable in Google Earth. At this time, agreements have not been made, but Google is "committed to continue the dialogue."
British army intelligence have proof to believe that terrorists are using the internet tool to pinpoint attacks on British troops in Iraq. So I would say the Indian government is justified in their fears. With the details of the world just a click away -- and accessible to everyone -- it's scary to think who might be lurking.
Google Earth is a free downloadable program where users can access stitched satellite photographs of the Earth. Search addresses, get driving directions, and view 3D terrain and buildings.