With Google Earth 5.0, you can record and share your stories with others using Touring feature, which lets you create guided, narrated flights around Google Earth.
How to make tours? Just press the “Record a Tour” button in the toolbar. This will bring up the tour recording controls in the 3D window. Hit the record button to start recording, and navigate through Earth like you would normally. When you’re finished, hit the record button again to stop recording and preview the tour that you just recorded. If you like what you see, click on the save button in the playback controls, and your tour will be saved to the left panel. You can click the right mouse button to email this tour to your friends.
To play: load a tour KML and double-click on its entry in the places panel. You can tell tours apart from other KML features by the camera icon . When you play the tour, a set of playback controls will appear in the 3D view, letting you control the tour like a video. You can fast-forward, rewind, seek, etc.
More info: Google LatLong Blog