This is my Google Tech talk which I also gave to AGU in December 08:
They didn't capture some of the annotations I used on screen very well so you may find it useful to view the presentation too (sorry for the quality, I had to hack something together because of the size of the original PowerPoint)
You may be worried that I'm becoming a little obsessed with the new tour functionality in GEarth 5.0 so you may be pleased to know there is no mention of it at all in this talk :). I'll be commenting on my fellow AGU Google tech talkers soon.
This was my AGU talk in 2007