This just came from the Google Educators Group:
"Speaking of changes around in the world - when it launched three years ago, Google Earth changed the way people everywhere access the world's geographic information. Since then, we've added useful features like 3D buildings, Street View, Sky in Google Earth, and countless educational content layers. This week, we are thrilled to unveil three exciting new features in Google Earth 5.0! With touring in Google Earth, your students can record and play back their own tours, complete with voiceovers! In addition, new historical imagery allows you to use a time slider to explore local and global changes over the past few decades. Finally, you can now dive to the deepest part of the sea with oceans in Google Earth! Our newest release allows you to fly beneath the surface to explore underwater canyons, see shipwrecks in 3D, and watch YouTube videos submitted by oceanographers and aquatic experts. Check it out at earth.google.com!"