One of the most prominent missing features of the Raspberry Pi is the ability to completely switch off the power. The only way to turn off your Pi is to disconnect the power cable. Not very practical when the Raspberry runs on batteries. Meet the Raspberry Juice: this board allows you to cut the power and bring it up again, on the times you specified. The board can be controlled over I2C or SPI, so it also works with any other device that supports one of those protocols.
The board uses about 10mW and is tested for 1A load.
Documentation can be found here