As I mentioned before, Google is partnering with the DE and AEAs to provide Google Sketchup to Iowa schools.
For teachers interested in using Google Sketchup but unsure of a hook to your classroom, you should know about the Model Your Town Contest from Google. The contest asks students to design 3d renderings of buildings in their towns via Sketchup, and then submit those for Google Earth.
Grant Wood AEA has taken the lead on this and is offering training for teachers in Google Earth. You can check out their website for more details about the project. Heartland AEA is developing an online course for Google Sketchup as well. Those interested to know more can contact me or Denise Krefting at the Heartland office.