I am sure you guys have already noticed this but just in case...

http://www.escapistmagazine.com/videos/view/miracle-of-sound/5714-Silver-and-Steel-The-Witcher-2
I should note there is a possible spoiler at the end of the vid so best to avoid it if you have not played through to flotsome.

And I should note this song was written for the Witcher 2 not just vid from the game set to music.