There is also not a lot on this one as I didn't document this ether, however once I had the Kindle jailbroken, I installed Kterm ( http://www.fabiszewski.net/kindle-terminal/ )
I was trying to get in using USB networking but I didn't know the root password and because I had wifi turned on when I enabled USBnetworking, it refused to let me in without a password. So on a hunch I jumped into Ktern and found that I was the root user there. I went ahead and did
# su
# passwd
Once I had changed the password for root, I was able to login through SSH in USB networking mode without issue.
Connecting to USB Networking isn't difficult its just a little confusing, if your in Linux (which I don't care who you are, you should be using Linux) you need to manually configure a network connection using the device USB0 make sure to manually set your computers IP and network mask. Once that is all configured all you have to do is turn on USB networking and plug in the USB cable. Your computer should automatically detect the connection and indicate this in your system tray or whatever indicator you have for your networking. Then its a simple matter of SSH commands to the Kindle.