I quite like the general concept of peer to peer file sharing things like BitTorrent. It’s very Clay Shirky, isn’t it? I have little knowledge of how it would work with the 2000-odd current holders of SPT materials, though. Would enough people have their computers turned on and allow access to the zip files to make it advantageous?
I suppose there’s bound to always be the original ‘seed’ open, possibly still hosted by something like box.net if they allow that sort of thing, and then anything else is just a bonus, really.