Sometimes being quick off the mark is as important as anything else. About two hours ago, I was informed of a pirate side holding thousands of books. I confirmed that works by some of my clients were there. Without authorization.
As the site was outside the US (and it was well after business hours there to boot), I sent an e-mail to the webmaster@nastysite, the individual who appeared to operate the site, and some individuals farther up the food chain. Within an hour of sending the e-mail, the site was down, and I had a contrite apology in my inbox from the site operator. Hopefully, that will actually result in a lesson learned. (Actually, I kind of doubt it; the nation in question is a marginal copyright citizen.)