The law is a terrible idea, we have satellites that can read license plate numbers, so most terrorists are smart enough to know NEVER to use a telephone more than once, and many don't use phones at all. These people are not as dumb as you think they might be.
Furthermore it has stated over and over again the Feds have the right to wiretap with a warrant for 72 hours, that FISA has the ability to hand warrants within an hour. So there is absolutely no reason for this power, and in fact the FBI several years ago told the Justice Department that they didn't want this this first time the law was passed.
So why are the pushing the Bushies pushing this survaillance law, a law that provides for unlimited surveillance without supervision? Because it has NOTHING to do with terrorism it has to do of keeping an eye on society.
And before you all scoff, Remember 4 years ago, Tom Delay tracked the private aircraft of congressional Democrats using secret FAA transponder codes. So there is already precedent about government authorities using their surveillance powers to spy on ordinary Americans.
You can be sure its not the first time either...