Google Earth Pro which has more features than Google Earth and lets you save satellite imagery at up to 4800 x 3192 pixel resolution is now free. Previously it was an annual subscription for $399 per year (I know this as I have an invoice for £264+VAT). It also allows you to use the imagery for marketing purposes. Sign up is no longer required for Google Earth Pro. Download Earth Pro from http://earth.google.com/download-earth-pro.html then sign in using your email address and the License Key GEPFREE.