I've noticed something missing from recent Pro Mini projects, like our self-driving Jeep Rover's steering servo.
What's missing? Power and ground rails, among other things. When it's time to move from breadboard to real world, here's my solution:
I created this 'duino clone for Putting In Projects -- PIPduino It has power rails, I2C port, FTDI/Serial port, SPI/ISP port, regulator (or power directly with 5V).
Embed in projects with standalone sensors and devices. Just build 0.1" cables. The ISP port doubles as a SPI port with D9 as the !SS pin.
Whatcha think? I think I'll go ahead and sell 'em soon and see what happens https://www.tindie.com/products/bot_thoughts/pipduino/