There's a good bit of information for how to jailbreak the CR-48 on the Chromium wiki. The basic idea is flip the developer switch behind the battery, and then do whatever you want in a regular shell.

Cr-48 Chrome Notebook Developer Information - The Chromium Projects
Poking around your Chrome OS Notebook - The Chromium Projects

went into developer mode and was able to copy files from the sdcard to downloads via the terminal trying to find a way to install a file manager like midnight commander. At least I know I can at least copy files over

How'd you access the terminal?

switched to developers mode
ctrl alt T
shell

So does anyone want to give quick lesson on what someone could accomplish using this shell? Maybe even just a command list?

You can even access the terminal without flipping the dev switch.

im not an expert on the terminal by any means can find my way around a bit, change directory copy files

cp is the copy command ex cp /media/FF1A100/DCIM/PHOTOS/*.* /home/chronos/users/Downloads
ls lists the directory
cd change directory ex cd /media
cd .. is change dir up a level
mkdir makes a directory
sudo before a command will give superuser permission for that command if know root password
exit leaves shell back to crosh

you can get to crosh but not to shell with the switch

What's the difference between shell and crosh?
And also, how do you list drives?

So are we talking dos commands? I'm not sure I even want to go back to that again. LOL! No, actually I very sure I don't want to go back there again. Just let me plug it in and have it work.

The rest of you codeheads can do all of that stuff. I have already served my time.