Most of my sentences that start like that end up becoming long involved projects and this one is probably no different.
I need an arduino and an ethershield for this idea.
I want to make a device that I can "telnet" to from the internet log in, issue a command and start, shutdown or reboot my home pc.
I have exposed a couple of ports on my Ubuntu box to the internet. I’d like to keep it powered down unless I intend to use it.
Having a device like this would let me save energy and secure my machine just a bit better. If it's turned off, you can't hack at it.