Interesting, but the skeptic comments on that page illustrate the obvious major flaws in such a system (pipe friction, variations in barometric conditions). Still, I'd rather have a 200 mile air conduit over the countryside than a 200 mile long oil pipeline.
Going vertical with this type of system is proving to hold more promise. This takes advantage of a chimney effect from heating the ground around a pipe, and would seem to be much more predictable than this one. I think there is a slight pressure differential in these systems for going vertical, which helps. Last I saw, the first large-scale one would be built in Australia.