If you want have some fun in the terminal with your new ARM Chromebook here's how to get a simple Arch Linux ARM chroot up and running. It assumes you already have your Chromebook in dev mode, if not google it before you continue.
This method requires no partitioning or other messing with your system, it just uses the fact that the /usr/local space is writable and persisted between upgrades.
First of, download http://archlinuxarm.org/os/ArchLinuxARM-imx6-latest.tar.gz
Open crosh with Ctrl+Alt+T