Despite Comcast's claims to the EFF that they don't target any specific application, the type of traffic being reported would be exactly that - targeted attacks on connections for specific programs. Although they couldn't confirm with 100% certainty that the forged RST (reset connection) packets are coming from Comcast's equipment, it can be confirmed that the mysterious connection resets only occur when one or more of the ends of a BitTorrent connection is through a Comcast connection.
You can find the entire EFF report in PDF format on their website.