If you're lucky enough to have an Aldebaran NAO humanoid robot, then you'll want to zip right over to the Apple iTunes App Store and grab the new NAO Control Server iOS app by Tommy Kammerer.
The Nao Control Server app supports starting and stopping behaviors installed on the robot, use of a joystick to control Nao, triggering speech, and other functions. To take advantage of the full functionality you have to pre-install a related Nao app from the Nao Store. But, even without the Nao Store app, you can command the robot to pronounce text and also trigger behaviors.
According to the iTunes app page, the program is compatible with iPhone, iPod Touch, and iPads running iOS 4.2 or later.