I have been, and will continue to be amused about the Storm over Big Brother database. Amused because I know ultimately that it will fail to stop terrorism, but also that I know how easily such a system can be overwhelmed into oblivion. The only reason for these databases is for political control, not for protection, but political gain. Security Theater, and nothing more.
Consider for a minute, should someone discover a method to product Weapons of Mass Destruction out of say, peanut butter. A database would have to track the purchase and use of every gram of peanut butter, and latter peanuts, raw and roasted, and then farmers who could grow peanuts. The data would grow exponentially and it wouldn’t find anyone who could or does produce WMD’s from peanut butter. It wouldn’t even be able to detect that the Peanut butter Bomb was a hoax.