Apth, SOPA gives the US government the ability to shut down websites for copyright infringement. DNS blocking is just one measure they would use. The problem with SOPA is that currently anything that is regarded as copyright infringement has to be proved before it is forced to be taken down. The onus is on the claimant to prove so. With SOPA as soon as someone claims there is something on the website that infringes copyright the entire website goes down, no questions asked.
If SOPA went through Youtube would disappear overnight. This is just one example.
I'm currently at work, so I can't get to Youtube, but if you look up SOPA Total Biscuit you should hopefully find a detailed video he put up as to why SOPA is such a terrifying piece of legislation. Because so much of the Internet is routed through the US, and so much of the content that we view is hosted there we would be affected as much as anyone else.
One more example that I just thought of, which could potentially happen. Someone creates a custom map in SC2 that infringes copyright, or is claimed to have infringed copyright. Battle.net would be shut down under SOPA!!!
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