Another link, Stanford's Law Review:
Don't Break the Internet - Stanford Law Review
Protect-IP/SOPA is a death kneel to the Internet and it's being masked as a feel good measure of controlling piracy. "We want to discourage piracy and encourage legitimate consumerism." "Oh really? That sounds good, I support it." And of course no one will read the full bills, only be enlightened by the veneer.
Furthermore, Congress doesn't understand how the Internet works or how it is utilized. They hear "piracy" and "illegal trading" and they go, "Oh, that's bad! We must stop this! Where is this happening?" and sign their name on the line without thought. If you don't understand even at the basic level of how the Internet functions, then you shouldn't be allowed to vote on something that will directly affect it.
Point is, people aren't going to stop trading music and movies and other files deemed illegal no matter what the government does. However, that's not the core issue here; it's how it will affect the millions of other sites and users who haven't done anything wrong at all.
Some other useful resources:
Firefox add-on DeSopa to bypass DNS blocking:
https://addons.mozilla.org/en-US/firefox/addon/desopa/
A 20-minute video that goes deeper into this bill (it's easy to grasp and the accent is British and that just sounds better):