VolumeCamera
Inspired by TapTapTap’s infamous easter-egg, I decided to make a quick app where the camera is triggered by the volume buttons. No private APIs were used. This is not intended for the App Store, but merely as an experiment.
If you’re an iPhone developer, you can get it here.
If you’re not, you’ll need to find someone who is to send you a binary enabled for your phone.
The source also contains generic code for monitoring when the device volume was changed, which you can use as you see fit, found under VolumeDelegate.h and VolumeDelegate.m.