Google has just announced a potentially great professional learning experience for teachers. The Geo Teachers Institute is a free for teachers event that will be held this summer. The institute will be a two day event, July 21 and 22, in which participants will get hands-on experience with Google Earth, Google Maps, and Google SketchUp. The announcement from Google didn't have many details, but it does appear that educators will have to apply to get into the institute. You can read the announcement here.
Here are some related items that may be of interest to you:
Google Earth Across the Curriculum
Free 33 Page Guide - Google for Teachers
Using Maps in an Elementary School Math Lesson