Interesting OP. I'm not sure if your niche, is also my niche and we're talking about the same thing but there are a group of producers and website owners in the tranny niche working fairly closely together to try and track down and share where our content is, which does save time and effort.
For my company, I don't think we are winning the war on piracy but we are limiting the damage. Our strategy is:
1. Have a full time DMCA'er working exclusively for us (he does a few other roles also) constantly looking for new links to report and new sites with those links.
2. We work with Pornguardian.com to send the DMCA's and track the links, this saves the DMCA agent a lot of time so he can look for more links.
3. Ask our members to report any links they see. It doesn't bring in a lot of links but does sometimes help us find new pages, forums, especially in other languages - we have a report direct page at:
http://www.grooby.com/piracy/ linked to every page.
4. If we find blogs or sites, then DMCA the hosts as well as the sites - we've had a lot of success in approaching hosts directly who will close down sites.
5. DMCA the payment processers. Paypal has closed accounts when properly DMCA'd as in their AUP. Become as much of a pain in the arse to these pirates as you can.
6. Tracking individuals. We've had some success on this but most are in unreachable places. We're just waiting for the day to track down someone uploading from the USA and that day is coming up fast.
All of our content is exclusive and a lot of it is completely different from tranny content available elsewhere, so by managing to keep as much of it off the boards, blogs as possible I feel that we are limiting the amunt of damage that can be done. Our sales and rebills are still very strong and although levelled off and we don't have the growth we used to, we seem to be in a better position than many companies.
When new technology and/or laws arrive, I hope to be in a position to use them.