What about an automated postal service. Like the Banks have with the drive through. There could be an air compression thing at each few spots. A main postal center in the middle.
You could even send packages if they could be frozen, cut into little tiny pieces and reassmbled with air compressions and grids. They could write the barcode to know how to assemble them in Xeonon Atoms like IBM did. If everything could get really really small pieces you could have fiber optic like speeds.
Gonna have to dig more into this.