Peermind “beta” just launched. Peermind registers and analyzes p2p traffic on the internet. They provide weekly top 10/25 lists of the most downloaded songs, games and software on various p2p networks.
At the moment they are tracking EDonkey 2000 and Gnutella networks but they are working on adding Fasttrack and BitTorrent traffic to their statistics. There’s an option to suscribe to the charts your interested in, to automatically receive weekly updates.
Peermind’s reports are offered for free and their services are likely to be extended in the near future.