TRAVELLERS OF GOOGLE EARTH can now watch Youtube videos about the places they visit in.
Google says it has added a Youtube video layer to cover Google Earth. The layer places Youtube videos in their geographical context and provides a new way of discovering and understanding the world, says the benign giant.
A SpokesGurgler said the vision "is all about the sense of place. Photos show the local view, but videos add the sense of life. The combination of Earth's " where" with Youtube's "what" makes the combined experience that much more complete and compelling."
More here. ยต
This is the first thing I thought of ...

http://www.artcom.de/index.php?option=com_acprojects&page=6&id=26&Itemid=115&details=0&lang=en

see also:
http://www.cs.unc.edu/~geom/Video/SE/

Several companies are making hardware and software right now to integrate these technologies... How long 'till they are all quietly bought up by or partnered with Google?
This is very interesting, especially for promoting public awareness in response to the world around us.
may I suggest 2 other alternatives:

1/ for more relevant video selection : http://www.VeniVidiWiki.eu is already placing videos from youtube, dailymotion, turnhere, google video ... on google maps, per categories

2/ with Google Earth 4.2, it is also possible to open .kmz files containing videos about specific topics.
As an example, here are the world capitals: http://www.venividiwiki.eu/kmz/Capitals-V1.0.kmz

feedback is welcome !