"Mastering Eng. Bob Katz confirms my theory on iTunes: Loudness wars over..."
I thought I posted it last year but it may have gotten deleted. I wrote a piece about experimenting with iTunes SoundCheck shortly after they released their Mastered for iTunes suite. The conclusion of it was that mastering should be working toward results that don't get affected by SoundCheck. You can read the tests I used to arrive at this conclusion and how to achieve this here - http://createdigitalmusic.com/2012/04/op-ed-what-do-mastered-for-itunes-and-sound-check-do-to-music-listening/
So it looks like at this years AES Bob Katz (literally wrote the book on mastering) announced that the loudness wars is over as of the launch of iTunes radio which puts SoundCheck on everything (no option to disable).