My knowledge of the bill is that it is an attempt by Capitol Hill to help curtail the incidence of intellectual piracy. My worries are the bills are strongly backed by the entertainment unions and by the entertainment industry.
I have heard many horror stories that the SOPA bill and others like it will severely affect writing done on the internet. The scope of the bills are wide and I feel that too large of a net is being cast. Even HubPages stated that these bills have a possibility of shutting down the site.