When Nobody Loves You [http://www.youtube.com/watch?v=l0bd_7HtIZg] - Kerli.
This was used in the video game adaption of Quantum of Solace.
Also, all three Elena Siegman tracks from Call of Duty: World at War's Nazi Zombie mode. Beauty of Annihilation [http://www.youtube.com/watch?v=w1B3KJP5x3M] being my favourite.
I don't know if This Is War [http://www.youtube.com/watch?v=gISlB1IdUjI] by 30 Seconds to Mars, which was used during the Dragon Age credits, was really fitting.
As for actual video game scores, my favourites are:
Sean Murry - World at War
Marc Canham - Facry 2
Hans Zimmer (and his various ghost writers) - Modern Warfare 2
Jack Wall - Mass Effect 2