If you're interested into self hosting, this project is also very promising : http://yunohost.org/
Go give them some love
So ArkOS is a platform for distributed apps?
In a nutshell, yes -- it's an easy way to install/configure server applications to self-host on your own hardware, without having to use the command line or obtuse webmins.
And this will only run on RPi ?
It runs on RPi while it is in Alpha, but part of the cost of the funding campaign is to extend support to more powerful single-board computers as well as full-size x86/64 machines.
Yep.. x86/64 would be great. I am not big fan of running anything on SD card/USB something