Ideal for making pin-to-pin connections. These are the products you need. Way better than soldering tiny sockets to wires and heat-shrinking them yourself!
Many microcontroller boards like the Arduino and Freeduino SB use pins to make your electrical connections. Unfortunately, a really nice cable to do so is not that easy to find. Enter the female to female connector! These really nice 150mm long jumper wires are an ideal solution for making these sorts of connections. They even fit to side-by-side on 0.1 inch spaced breadboards!
They come in a package of 100 jumpers: