I'll nominate Little Brother by Cory Doctorow.
Abstract from Doctorow's web site:
Little Brother is my first young adult novel, a story about hacker kids in San Francisco who use technology to reclaim democracy from the Department of Homeland Security after a terrorist attack and the concomitant crackdown. It was published by Tor Books on April 29, 2008.
Even though I have already read it... I am sure the discussion thread will be interesting considering the topic of the book being personal freedoms in the modern age of "The War on Terror".