Prophet (http://syncwith.us/) was originally talked about as a way to build a darknet or sneakernet. Perhaps some are still pursuing that, though the main public development has to do with building SD on top of it and using it for distributed bug tracking.
I'm sure you know usenet still exists. It's weird to hear it described in the past tense. :)
I'm sure you know usenet still exists. It's weird to hear it described in the past tense. :)