RealityPrime blog has released the following article this week:

How Google Earth [Really] Works
link:
http://www.realityprime.com/articles/how-google-earth-really-works

It appears that the author put the first part 'Drawing a 3D Virtual Globe' out first.
Warning: The article is very technical;)

Yes, Stefan Geens wrote about that few days ago on Ogle Earth:
http://www.ogleearth.com/2007/07/mustread_avis_h.html
he said that the author "was one of the developers on early versions of Google Earth, when it was still Keyhole Viewer".

Wow, it's very nice, thanks for sharing the link :)