I think the best jumping off point for more information is Wikipedia:
If I’m not mistaken, SOPA has been pulled, but a vote on PIPA is expected soon.
My opinion: We already have laws and processes to address the kind of online piracy these bills are meant to cover. I also don’t support any laws like this that do not allow for due process. There is a process for rights holders to exercise their copyrights and companies should use that process.
I also believe that copyright laws written at the turn of the 20th century are not applicable to now. Much has changed and companies have to accept the reality of the Internet. I would rather see companies come up with new business models and innovate rather than litigate and lobby politicians.