The Beastie Boys - In A World Gone Mad I love the sentiment, although the actual song is sub-par.
Zach De La Rocha and DJ Shadow - March of Death Now that's what I'm talking about. Zach is finally back, and he came back hard as hell.
Me'Shell Ndegeocello - Love & Forgiveness This is nice as well, recorded right after 9/11 and released in the days before the war, as Me'shell explained here
Sarah Jones - Whose War? (Emergency Rough Cut) And last but not least, a brand new song delivered to me personally by Sarah Jones, at Saturday's protest. Razor sharp lyrics, and nice work flipping the Nas chorus with the Bob Marley "I Need A Hammer" sample.