John Martin has self-archived "Piracy, Public Access, and Preservation: An Exploration of Sustainable Accessibility in a Public Torrent Index."
Here's an excerpt:
Using a snapshot of torrents on the site, this study considers the potential for torrent networks to preserve and provide access to cultural materials in the form of digital media content. Metadata from 2.1 million torrents were categorized by media type and the robustness of given torrents was assessed. Trends over time, such as number of uploads and volume, were also investigated. This study found that relatively few torrents exhibit long-term survivability, even though the overall volume in the index shows continuous increase.