This link is a bit old, but it contains some pretty amazing views within Google Earth: http://www.pagog.com/2007/08/03/interesting-google-earth-finds/
These views go beyond the typical crop circles most people look for! My favorite is the Arizona farm with an enormouse homage to Oprah Winfrey:

The webpage linked above provides the latitude / longitude coordinates for each view, so you can enter the exact location in Google Earth and check them out for yourself. Very fun!