"Imagine attempting a global traverse that would take you 50,000 kilometres through some of the most difficult terrain and extreme weather on the planet, all the time attempting to use only human power and the natural elements."

Sounds good, doesn't it?  But just can't tag along?  Well,  you can virtually with World Wind soon enough.

The BrinkX Expedition will soon be allowing you to follow along using World Wind.  You can see where they are now and where they have been.

Looking at the site.. I think a lot more can be done with World Wind than just showing a "we are here" marker.