The power of Google Earth is the seamless, immersive 3D fly-throughs that give you a sense of being “there,” so a lot of adjustments under the hood are made to make flying around the globe faster and smoother. After few more tweaks and bug fixes, Google now removed the beta tag from Google Earth 5.1. This release also includes the Google Earth browser plug-in for Mac users, all in the same installation. Both Mac and PC users can explore all of the exciting Google Earth sites that developers have made without having to mess around with another installation.
More info: Download