UPDATE: please see this page for the latest revision details.
I’ve posted details about one of my last projects that I’ve been working on.
ATXRaspi is a smart power controller for RaspberryPi or similar embedded systems running form a 5V input. It allows you to have an external shutdown button to turn off your target system without a need to login or to issue manual shutdown/sudo halt commands. I needed this so I could power off my Pi without having to log in all the time. I wanted a physical button to shutdown/turn off my RaspberryPi.
Also now available in the shop, pre-assembled or as a DIY kit.