Google Earth has just been updated to version 4.2.0198 (download here), but it’s taken a few steps to get there.
On September 14, Google released version 4.2.0196. The big thing in this release was the support for the SpaceNavigator in “sky mode”, which is a great addition. However, later that day Google pulled the new release due to some bugs and made 4.2.0180 the “current” version on their site.
Now with the release of 4.2.0198, SpaceNavigator support in “sky mode” is back in place. Frank Taylor at the Google Earth Blog has a few additional details about this update.