http://daringfireball.net/2011/03/dirty_percent
To me it seems like apple is implementing not only a tax on all apps that run on the device, which has been there from the start and is ok. As a customer I like the fact that the apps are centralized and under quality and security control.
But the new move seems to be a tax on ALL MEDIA played on or loaded on the device. I don't want apple to control the data I load on my device, and this is what they're doing.