I hate having to plug my quadcopter in to USB, so I wanted to use an ESP8266 with esp-link to talk to it over wifi. However, I didn't want to permanently attach it as I can only have one of the two active at a time, and I want the wifi module to be easily disabled to reduce RF interference.
So, I designed a mount that I glued onto the side of the quad. Simply pop the bare ESP8266 in, and you can connect to the drone over wifi while in flight. Pop it out, and USB becomes available. It has pogo pins for ensuring a good connection and a snug fit so I won't lose connection mid-flight.