Pretty fantastic post-apocalyptic drama. 3 EMPs knock out electrical systems over the continental US, and the story is set in a small town in North Carolina, where the residents have to adapt and then band together to defend the town from rampaging hordes of refugeses.
It was distressingly realistic, and I've read more about the actual possibility of this kind of attack, and it is kind of scary.
If you want to really freak yourself out, go to http://www.empcommission.org/ - the full report to Congress is at http://www.empcommission.org/docs/empc_exec_rpt.pdf.
Great read, pretty good book, and *very* anxiety inducing. Good times!