A new (and important) Google Api, that makes remixing the web a lot easier and some really nice 3rd-party Google Earth extensions (mainly for infovis):
Googe Feed API:
Google Earth Add-Ons
GE-Graph was developed to generate graphs from kml files saved by Google Earth.
The data can also be typed into the application or pasted from other applications.
The file generated by GE-Graph can be exported to Google Earth.