From the changelog from 1.12.0:
- Added support for controlling iTunes from within World of Warcraft. You can bind a set of keys for play/pause, next track, back track and volume up and down.
I already love this patch. Even though it cripples Warlock's Howl of Terror even further.
[Edit] And they added support for Growl in the Blizzard Downloader! How cool!