Only furries could create something so ridiculously mundane that it completely circles around lameness and cycles back to being totally awesome again. This RFID-enabled Arduino-driven tail apparently reacts to different mood chips, wagging if your happy or excited, so on and so forth.
The tail is also controllable with the Wii Nunchuk remote. If your dressing up as a possum for Halloween, this tail could be an invaluable addition to your costume.