Just a quick note - saw it this weekend on TNT for the first time since its theatrical release. Still a pretty good movie, despite a couple of glaring plot holes, the worst of which is the fact that they did not disable John Anderton's access codes as soon as he was declared a pre-criminal. And worse, they still didn't disable them even after he was in "jail", allowing his wife to use them to break him out!
But otherwise, a solid example of the "let's introduce a new tech and see what happens" genre (much like Strange Days), and since it's Spielberg, it's pretty well realized. Although I hope the vertical roads never come to pass. Four stars.