Google has released Google Earth browser plugin allowing users to enjoy full 3D digital maps within webpages, using the Javascript API developers can make use of this powerful platform to develop interesting 3D map applications and embed them directly onto webpages requiring just the browser plugin on the user's end to work.
Using the API developers can draw markers and lines, drape images over the terrain, add 3D models, and even load KML files, allowing them to build highly sophisticated and advanced 3D map applications, existing Google Map's can be 3D enabled by simply adding a single line of code.