We've removed all the books from dd's room before, when she's been grounded from reading.

Thing is, if we're serious about it, we have to go over it with a fine tooth comb--she hides them everywhere. Under the mattress, behind the dresser, in the drawers, under the stuffed animals...and that's just in her room. She also hides them under the bath mat in her bathroom. And we wonder why she's in there for an hour at a time.

To answer a previous poster's question, she reads anything and everything, but she's especially into the Hunger Games trilogy and similar dystopia-type books right now. I made the mistake of giving her the Giver before bed one night and she couldn't sleep until we'd had a chance to discuss how unfair that society was. She's big into issues of justice, fairness, etc. She did a great book report on Witch of Blackbird Pond last year and every time she'd mention Kit being accused of witchcraft, she'd add "which is TOTALLY RIDICULOUS!" as an aside.