I've informed Legal at the house where I work. There's a bunch of our stuff up on their site.
Apparently the owners will take stuff down if you complain, but it just pops up again a few days later. If they take material down, and then it goes back up and they leave it up, I believe they're in some measure liable for the infraction.
The reason I'm putting it here, aside from the obvious, is someone on one of my author groups said the site takes the issues a lot more seriously, or has a broader expanse of what it can do, if the actual author contacts them. I'm not sure about that--it sounds rather fishy to me--but I thought it was worth a warning to everyone anyway.