In case my opinion isn't entirely clear, SOPA (Stop Online Piracy Act) and PIPA (Protect IP Act) are junk.  The laws display a catastrophic ignorance about how the Internet actually works, are so poorly written as to invite abuse, will most certainly be abused (based on how the MPAA and RIAA have conducted themselves in the past), and will move the United States uncomfortably down the road towards a fragmented, censored Internet.

If you aren't all that technical and want an idea of what's wrong with these laws, reddit has a good post on the topic.