I NOBO hiked the AT in 2009 with a GPS logger and recently stumbled upon this gem from a Google Maps video presentation:
http://www.youtube.com/watch?v=HMBJ2Hu0NLw
Go to 35min 34sec and you'll quickly catch the drift of this idea. It seems rather likely to me that there would be GIS based groups, universities, or even the forest service that would be interested in paying someone to hike the AT (or any other long distance trail) to gather data. I realize that there are limitations on the daily usage of batteries/other issues, but I imagine that this type of torture test for equipment would potentially interest Google in funding a hike to allow for further development of the technology.
One other thought is that it may make the most sense in a section hike / group hike / supported hike. the supported part is pretty obvious I guess, but still could be a great way for anyone interested in GIS or hiking in general to make a name for themselves. Not to mention a cheap (if not free) through hike.
Just a thought, what are yours?
-McBride
GA-ME 2009