Recently I built a temperature logging device using an Arduino. It used a Real time clock, SD card writer and a temperature sensor. I did not need a bread board for testing as all the sensors were on breakout boards. All the devices needed 5V and ground to operate and I wanted to power them from the Arduino, but the Arduino only has one 5V outlet and three grounds. I had to get out a bread board just to have a way to attach all the power and grounds.
Wishing for a way to have more outputs available I came up with this Micro shield.
This is very simple to build and I think useful for doing some quick prototyping. You of course could use an empty shield or a bread board, but what fun is that?