P2P traffic distribution by format
The study showed that Microsoft video formats represent 46% of aggregate worldwide Peer-to-Peer traffic. 65% of all audio files by volume of traffic are still traded in the MP3 format, but a surprising 12.3% are in the open-source Ogg file format (almost all exclusively traded on the BitTorrent network, particularly in Asia). The study also again showed that the eDonkey2000 network is the "network of choice" for video sharing.
The study also showed that BitTorrent is now increasingly being used for legitimate content distribution. The study is based not on estimates, but on actual packet data and traffic levels analyzed at Tier-One ISPs (Internet Service Providers) worldwide.
Source:
CacheLogic