Eagle Eye

Plot: A young slacker and a single mom get tangled up in a terrorist cell plotting a political assassination.

My take: No kidding - this had me riveted. The idea wasn't original, I could see the ending coming, but I was still amazed at the prospect of such an sentient, omnipotent supercomputer and its ramifications. I loved the way they kept using closed-circuit camera shots to show us what Eagle Eye was seeing.
Now I shall call my friend and ask him to jump through a window - now. =]