Alex Wissner-Gross, TEDxTalks, Networking Faster Than Light, here. Nice talk. DynaPie Infrastructure. Pretty sure that the optimal intermediate location can vary over time, as we discussed previously with some simple scenarios. Probably optimality depends on your objective function in setting up the problem.
The performance of a wide variety of globally-distributed online activities is increasingly limited by the finite speed of light. Dr. Wissner-Gross recently introduced technology for partially mitigating the impact of this limitation on the coordination of geographically distributed activities, such as virtual worlds, currency exchanges, telepresence, and remote surgery. His solution involves positioning computer servers in optimal intermediate locations such as oceans and other network-sparse regions, opening the possibility of geographic remoteness becoming a new form of natural resource for developing countries in the next decade.