Google Earth download comes bundled with Google Chrome browser
Whether you want it or not...
Google Earth boasts, as of right now, its very own website, featuring "lots of great content including images, videos, tours, maps and tutorials". Google Earth's new website The one-stop Earth shop does indeed contain a raft of tutorials, info on the mobile version (for Nexus One, Droid, etc, iPhone, iPod Touch or iPad), …
My Google Earth doesn't detect an update, but CNET's Tech Tracker told me there is one. I saw that the download from the official site bundles Chrome, but I was able to deselect it. You are not forced into it. There are two options selected : Bundle Chrome and Make Chrome Default. Just uncheck the boxes and you won't have to worry about it.