i would suggest a torrent agregator program that would notify and distribute whole software repositories to every node in the network for both redudancy and speed. the system would begin by a temporary analysis of the point of origin and MAN networks available and then work up to the WAN networks.
the system would not require any form of logins or account rather it would just use a tracker mantained by the root DISTRIBUTION like FEDORA, DEBIAN, GENTOO, OPEN-SUSE etc. the big ones. the derivative distributions would just use different administration accounts on the same tracker but be a sub-directory from the main root. there would also need to be a way to encourage users to contribute time spent on the network and bandwith provided. some sort of compensation.
anyway that is just a thought. i’m not a fan of the fragmentation in the GNU/LINUX space either.