The ACTA is a treaty drafted in secret which is being negotiated between most of the world’s countries and which, among other things, proposes certain agreements between governments regarding the Internet.
I suggest you read this BoingBoing summary of the Internet section of ACTA.
Did you read it? No? Go ahead, click that link. I’ll wait.
Alright, you’ve read it. Surely you’ll agree, this is A Bad Thing(tm). There is no possible scenario in which this treaty can have a good effect on the Internet.
Please everyone, write your House Reps and Senators and demand that this be examined by professionals who actually know what they’re doing. That way it can be destroyed before it’s ever agreed on by governments.