Adafruit Industries Adafruit Industries Pi T-Cobbler Plus Kit - Breakout for Raspberry Pi
The T-Cobbler Plus is an add on prototyping board from Adafruit specifically designed for the B+ and Pi 2 that can break out all those tasty power, GPIO, I2C and SPI pins from the 40-pin header onto a solderless breadboard. This set will make "cobbling together" prototypes with the Pi super easy. Once soldered, you can plug the 40-pin GPIO cable between the Pi computer and the T-Cobbler breakout. The T-Cobbler can plug into any solderless breadboard (or even a prototyping board like the PermaProto). The T-Cobbler PCB has all the pins labeled nicely so you can go forth and build circuits without keeping a pin-out printout at your desk. We think this will make it more fun to expand the Pi and build custom circuitry with it.
Adafruit Industries Pi T-Cobbler Plus Kit - Breakout for Raspberry Pi