This is a great software for just what you are looking for, you can also set it to block internet usage after a time say 10pm until 8am, word o warning though, it does not stop MSN Messanger. But its really good, you can also set to sent you an email informing you of the web sites visited. Happy Safe Surfing!
I still think you should have a serious word with your daughter if you havent yet, talking is youre best weapon.. Dont just block whatever without making her understand its wrong, that wont help you as much as you might think (most cases)
Im happy with the K9, my daughter, as of yet, knows very little about safe mode etc so I'll be ok. K9 is decent and its easy to use aswell as free. Thanks everyone!