Not long ago I received the Pi Switch kit from Pi Supply.
I have created a couple of videos to show what the Pi Switch is for, how to build it and how it works.
The first video is on how to build.
shortly I will add the one on how to configure the software part and how to use it.
The software that is currently available is only working for Rasbian Wheezy but a new one for Jessie will be available soon. For the moment I have created a little patch on my GitHub also thanks to Russel Davis (aka @ukscone) and we have asked Pi Supply to test it and upload it to their channel.
Here you can also find an assembly guide from Pi Supply and the code examples for Wheezy.
Hope this is coming handy for some of you!