DMCA processing software

I'm curious what people are using to manage DMCA takedown notices in mid-sized networks. I've been searching, and have found the ACNS spec, and a few obscure references to an RT plugin, but not much else. As the ISP I work for grows, manual handling of notices is starting to be a problem. I'd prefer something open-source so we can extend it to hook into our other systems, but primarily I need something to parse the notice emails, store the information, track the number of incidents over time, and generate letters to users. If nothing exists, and everyone just has in-house proprietary systems, then we'll start down the same road, but I don't like to re-invent the wheel if I can help it. Thanks