Dave Harper used a trio of Teensy boards to develop a ZigBee based whole-house audio controller.  It’s pretty awesome that he was able to  emulate an expensive commercial amplifier with this DIY project.

The Teensys emulate one of three MDS-6 audio amplifiers, each of which has 6 source inputs and six stereo zone outputs.  The amplifier requires one serial input line and three LED output lines per zone, making the 24 I/O line Teensy a perfect fit.

 

Vitaly Minko created a tiny One Thumb Keyboard (OTK) using a Teensy++ 2.0.

The OTK provides customizable buttons to create your own useful shortcuts.  The tiny form factor allows it to be attached to a bezel of screen for easy access.  The OTK is particularly useful for creating shortcut keys for something like photo or video editing software.

Details of the project can be found on Vitaly’s great website.

Discussion about this project can be found on the PJRC Forum.