Google Earth Pro is (according to slashgeo) about to be free.
'Slashgeo.org' have just posted a new entry siting the following:-
"The Google Earth Blog (independent from Google) found out that Google Earth Pro is now free, it was formerly $400 per year.
There hasn’t been an official announcement yet, but as pointed out by a GEB reader,
The GEB languages other than English list some features available in the Pro version not available in the Free version:
You’ll find more details about what the Pro version has to offer on the Google Earth Pro official webpage. Wikipedia lists GIS data importation and advanced printing modules part of its features".