Like I said just a little while ago, blacklist are evil no matter what reason you had for having them. Here's a case in point: Censorware generally censors blogs. That's a lot to miss to stay porn free. In fact I think you could argue that censoring technology this broad shouldn't even be legal - certainly not for any public system. That smacks a little too much of government censorship to be acceptable. Of course the tendency is to go the other way - since public systems (e.g. school computer rooms) need to fight complaint from a varied group of conservatives and the generally anxious.