AirVolume

AirVolume screenshots

AirVolume uses your volume keys to adjust the volume in iTunes via AirPlay.
Version Window
AirVolume 1.0 : Version Window

Alternative downloads

SoundBunny
1.1.4
This program allows you to control the volume of any app running on your Mac.
iTunes Volume Control
1.5.2
FREE
Control the iTunes volume.
Bose SoundLink Air Wi-Fi SetUp Application
1.0
FREE
This app allows you to set up the AirPlay feature of your SoundLink Air system.