I have been researching online for other people who have been working along the lines of using a teensy or a similar HID device as a penetration testing tool. Check out these fellows:
- Adrian Crenshaw at irongeek.com, has done some amazing work on the teensy platform. Had I been at Defcon 18, I would have known that he started this project back in 2010. Check out this page for information on his research and the Programmable HID USB Keystroke Dongle (PHUKD) Library.
- Darren Kitchen from Hak5.org has been working on a project he likes to call the USB Rubber Ducky. Check out their forum to find out more.