Yeah, I had the quite naive notion, that you jailbreak your device and the Linux root just magically pops up somewhere, when you connect your device as mass stoarge via usb.
Some catchphrases like usbnetwork and connect via ssh would have speeded up things a little for me.
But anyway I got it done... the included dictionary isn't even drm encrypted
the howto
http://inportb.com/2010/06/15/kindle...2-5-with-root/