Alright, Google continues to be on a roll with the release of Google Earth 4 Beta (of course it is Beta). There are a variety of enhancements that you will see while using the new version. Some of these new features include a new user interface, integrated SketchUp designs, and some KML improvements.
I would say that the biggest thing is that there are Mac and Linux versions now available! The Mac version is a universal binary which will definitely expand the Mac user base for Google Earth. I knew the Linux version was in the making but I wasn’t expecting a release so soon, especially a completely new version!