Transport on demand This looks as if it is beginning to come about
Shipping Batteries Could lithium air fuel cells have sufficient energy per unit mass to power commercial shipping? Batteries could be housed in shipping containers.
Buoyant Towers Could fixed structures be constructed that overcame strenght limits by making them buoyant. Neon might be used as the lifting gas fill, it would have about a third of the lift as helium or hydrogen but much easier to contain.
Favour tokens A painless micro payments system to replace advertising for paying for internet content.