Jeff Atwood talked about doing an ISP-to-ISP file transfer:
What is this? I tried Googling for it, but couldn't find anything. We have a need to transfer large amounts of data between two data centers, and this sounds interesting.
He just meant he was transferring data between 2 servers behind large internet connections (OC-1, etc). Particularly between 2 datacenters which usually have internet connections in the measured in gbits.
I don't think he meant he was using some sort of special connection made. Just using the large bandwidth ports provided with the server to transfer the data.