The Raspberry Pi (Model B., revision 2). The brown & black wires go to the RPi reset, and the colored cable goes to the RTC. The purple wire is for shutdown detection.
Better shot of the Pi with the 2-pin header added to the board for reset.
The DS1307-based Real-Time Clock (RTC) from Adafruit (http://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi/overview)
The DC-to-DC ATX power supply. The connector was removed and the wires fed into a terminal block for easier wiring. The PMU is powered off the +5V standby lead from PSU (purple lead) and the green wire is the ATX trigger.
Wireless keyboard/mouse combo. TV remote shown for size comparison.