Dash Robot
Small toy robot from Wonder Workshop (Model DA02).
Can be controlled and programmed through Bluetooth with a simple block-based visual programming language. Dash can drive around and can move it's head left/right/up/down and can make sounds. Has a ring of controllable LED's around its eye (on/off/RGB color). Has a few basic sensors (IR distance, gyro/accelerometer, microphones) that allow some autonomous navigation (e.g. through a maze). Comes with some LEGO-compatible attachments for integrating with other equipment.
Great for activities with children, for participatory design, rapid prototyping, etc.