It's fairly self explanatory but here's some of the blah behind the imagery:
The focus is on the 3 main "icons": Bradley, Julian and WikiLeaks. There's a hint of Collateral Murder in the background including the "Light em all up" line (bottom right). There's the obvious reference to the significance of this video release, with the quote also being turned around to feed the fiery crowd, inspired by the beats radiating from the WikiLeaks hourglass boombox! Blah.
Update 12 June 2012
And here's a reworking I've just completed of another bean's idea with the WL hourglass shape in the treble clef. Let me know what you think!
The latest version: close to the final now!