POISONED FRUIT. Perhaps this is obvious, but the thing about the big NSA phone records dragnet is that this gives us the previously missing explanation as to why the administration thought it was so important to illegally wiretap people without warrants. That used to be a bit mysterious -- if the idea was to spy on people with al-Qaeda connections, getting a warrant should have been easy. The problem is that the evidentiary basis for believing the people in question had al-Qaeda connections now turns out to have been illegally obtained evidence from the broader NSA program. And then the problem reiterates itself -- if the listening-in stage of the program reveals anything interesting, you can't use that in a court either. You can't use it to get further warrants, you can't use it as the basis of a prosecution, basically you can't use it at all. So if you want to act, you're going to need to do one of these detention-without-trials deals or maybe a "rendition" or a military tribunal or what have you. And then, once the guy's in custody, if he tells you anything you can't use that either. So the whole process starts again and soon enough there's an entire parallel justice system operating entirely in secret without any oversight or real rules.
And that's the optimistic scenario in which all of the relevant people are maximally honest, honorable, and competent. Leaving aside the reality that nobody with a single shred of honesty or basic human dignity would be working for George W. Bush at this point, that's simply not a realistic picture of any large-scale enterprise. Things are bound to go wrong -- badly wrong -- when you have all these people operating outside the law without any checks or scrutiny.