after my long awaited news from bt inc

they released the API , and the BT client so now you can let your users share their bandwidh so they don't over kill your monthly bandwidth, this is good if you have large amount of files to serve to users, with this i think its really unlimited usage as long as your internet provider doesnt have cap on monthly bandwidth

could be giving out maybe TB of bandwidth between 1000 users downloading 700 mb videos all the time

what you can do with this
P2P streaming, you can use hfs to host the direct files and stream through any player wmv, flv player, vlc etc
you can enable your hfs to support large amount of users downloading a single file. its really a great thing right now im trying to integrate this with my vlc theme, i will later convert it into flash video support just in case it gets interesting and want million users visiting my hfs server
http://www.bittorrent.com/dna/guides/dna-integration-guide/getting-started-what-is-dna