if this passes, you are going to start seeing liberal cities like San Francisco and Portland setup public internet access with WiFi and WiMax, to allow citizens to be behind their NAT with a non specific IP address, so actual specific traffic cannot be matched to a person.
this is what the criminals are going to do anyway - they will start using McDonalds and other free WiFi places to conduct these activities.
You know, be it "sneak and peak" or wiretaps or data mining or whatever.... There's a real simple way to address both national security and 4th amendment issues.
Pass an exculpatory law that any evidence of a crime discovered by these "anti-terrorism" searches that is NOT terror related CANNOT be used in court.
If the FBI thinks I'm a terrorist, but I turn out only to be bragging about running a stop sign on a chat room, then move along, copper!
If I am a SF lib nutter claiming "Death to America" and I illegally bought some C4 with intent to use it in a terrorist plot, then throw the book at me.
And even in a bad case where an anti-terror wiretap turns up good old fashioned tax fraud, then, sorry IRS, you gotta catch me some other way.
Granted, the Bush Admin is not going to use the NSA to prosecute traffic violations. But to codify that into law now would allay any fears of being hauled off to jail in the middle of the night because some computer flagged you as looking at too many "hate" sites like FR!