Shoogle is a novel, intuitive interface for sensing data within a mobile device, such as presence and properties of text messages or remaining resources. It is based around active exploration: devices are shaken, revealing the contents rattling around "inside". Vibrotactile display and realistic impact sonification create a compelling system. Inertial sensing is used for completely eyes-free, single-handed interaction that is entirely natural. Prototypes are described running both on a PDA and on a mobile phone with a wireless sensor pack. Scenarios of use are explored where active sensing is more appropriate than the dominant alert paradigm. Author Keywords Audio, vibrotactile, accelerometer, multimodal, mobile ACM Classification Keywords H.5.2 User Interfaces: Haptic I/O; H.5.2 User Interfaces: Interaction Styles; H.5.2 User Interfaces: Auditory (nonspeech) feedback shoogle v.