Maybe you saw this, maybe not... next time you download Google earth check out the newly revised EULA. Of interest is this reference to business users:
USE OF SOFTWARE; RESTRICTIONS
Use of Software. For an individual end user, the Software is made available to and may be used by you only for your personal, non-commercial use according to these Terms of Service and the Software documentation. For a business entity user, the Software may be used by you and your employees for internal use according to these Terms of Service and the Software documentation (individual end users and business end users are collectively referred to as “You” herein).
Source: http://earth.google.com/intl/en/license.html - thanks to reader Heather for reminding me about this one!