USB HID Extender - Fully support Windows and Mac System | Rextron USBXS-M120 Model USB to Serial RS-232 Converter/Reinforcer
Updated tutorial: USB HID Terminal Alternative – Trinket Fake USB Serial @ The Adafruit Learning System « Adafruit Industries – Makers, hackers, artists, designers and engineers!
USB-HID Cable for receiver
USB Input module (HID)
Build Your Own USB HID Joystick Device and Game Controller - DZone