I’m pretty sure the majority of my projects will never be considered “Complete” as I’m always tinkering with the firmware to add or refine features.  However, I like to give my projects a finished look which means they will be inside of enclosures or integrated into other devices.  It would be nice if I could update the firmware without having to dissect the project to get at the controller.  To accomplish this, I created a XBee plug for my Hobbyduino Mini V3 Arduino clone.  Check out the gallery here and the tutorial here.