I've not got extensive experience, but what I have matches johnhh's advice. Where it's very obvious that the whole site is taking the mick (as opposed to one or two pages that might have been stolen unbeknownst to the site owner) then go straight to the webhost with proof. All the UK hosts I've had to contact took it from there and either got the content taken off the site or shut down the account.
We do it when have time, UK ISP's don't want to get involved. They will even take down site's and contact the owners for you if you can't contact them. This applies to sections of pages as well as whole pages.
HP, From experience, if you write to the hosting provider, they will remove copyrighted content, even ones based outside the USA. You will have to prove that the content is yours, and some will act on a DMCA even though legally, they do not have to. I find that it helps if you have a firstname.lastname@example.org email address to write to/from.