You can find a flowchart of the new vs. old FISA laws at the Ketchup and Caviar blog. One of the more interesting aspects of the law is that it removes the requirement that there be probable cause that the foreign subject whose communications are being intercepted be a suspect of any kind. Basically, the law allows dragnet surveillance of communication between Americans and non-Americans. Knowledge of who talks to whom, even without details of the communication is extremely valuable to government and business. Supposedly, one of the functions of the great firewall of China is to accumulate data on who talks with Chinese citizens for economic analysis. Would the US government use a law supposedly designed to catch terrorists for economic analysis? Would elements of the US government feed data about who competitors talked with to their friends in business, particularly, since oversight is weak or non-existent? Nah, couldn't happen here.