[Year 12 Its] Google Earth.

[Con Zymaris]

Haven't seen mention of this tool on any of these forums, so on the 
off-chance you haven't stumbled across it yet, check out:

 http://earth.google.com/

It's not open source, but it's an awesome educational resource. ;-)

Enjoy.
 
Con Zymaris, Convenor
Open Source Victoria
http://www.osv.org.au/

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