Off-topic, the ATtiny85 LuminchOne
I fell in love with the LuminchOne when I saw it last year, and since then I wanted to build my own. Even bought the Luxeon Rebel and the proximity sensor together with my SIK. I felt that using a whole Arduino board was a waste, so, as suggested by the author, I recently designed this board with an ATtiny 85. The board has a 7805 so I can use a wall adapter power supply and is prepared to hold 3- and 2-pin polarized connectors for the sensor and the LED respectively.