Google Earth 6.2 is out of the gate for Windows and Mac.
Today, we’re introducing a new way of rendering imagery that smoothes out this quilt of images. The end result is a beautiful new Earth-viewing experience that preserves the unique textures of the world’s most defining geographic landscapes—without the quilt effect. This change is being made on both mobile and desktop versions of Google Earth. While this change will appear on all versions of Google Earth, the 6.2 release provides the best viewing experience for this new data.
Some other nice stuff in there too, new search interface, Google Plus integration, and so on.