I've heard they pulled Box Office from the App store. I have the app, and find it useful. I'm curious what the problem was that Apple had to take it down.
The developer posts over at the ArsTechnica forums, and he can't give any specific reasons, but he says he believes it will be back up sometime soon.
It was most likely because of rotten tomatoes. RT is supposed to be making their own app just like IGN. (RT is part of IGN Entertainment) Like IGN the RT app would have staggered reviews. The newest ones would be on the site so they can still get traffic for their ads. After a set amount of time they would be available on the app.