Was wondering if this might interest anyone.
There is a guide posted on the Software Freedom Law Center's blog (from Dec 2014) on how to install Debian onto a Chromebook. Any chromebook.
http://www.softwarefreedom.org/blog/2014/dec/01/de-chrome-ac…
This guide is particularly for the Acer C720 model but I believe it is possible on any model.
So the ozbargain strat is, buy cheap chromebook, de-chrome it and get a light-weight laptop with full power, full freedom and good battery life.
Thanks for that link.
This method actually replaces the ChromeOS, hence de-chroming. There is another approach which installs Linux on the side, search for chrome crouton.
So far I've satisfied all my needs with ChromeOS. The one thing I miss is being able to run openvpn to a non-standard port. So far I haven't needed that yet.