I'm excited because I just received licensing for Google Earth Pro through the Google Earth Education Initiative. Your school can get the full blown Pro version of GE for free for one year. Simply send an email to Debra Kettman GEEC@google.com expressing your interest. She will in turn send the newest qualifications document for your review and response.
And for some great tips on using Google Earth, check out the Using Google Earth blog: http://googleearthuser.blogspot.com/ That's where I found the link to this video.