I agree that the logistics stuff seems to be the hot item in "precision ag" right now. 

By the way... did you know that the Terms of Use of Google Maps and Virtual Earth preclude you from doing a real-time display of the location of information based upon GPS or other positioning technology with the "free" licenses?   Virtual Earth says the position fix must be at least 6 hours old.  I don't recall the exact wording on Google Maps. 

That's not to say that people aren't doing, it, though.