Thanks for the info.
I do remember reading somewhere that the serial on these demo units will actually pass on Amazon.
Google'ing "CyanogenMod" lead me to another forum (from there I found numorus links/downloads/info .. all related to stock units, but maybe its worth a try anyway).
From what I can tell (by looking around at various sites) rooting even a stock Fire is a long drawn out & complex process (certainly looks do-able though...some of the commands look unix/linux 'ish
A 'stock' Kindle ROM is 200mb .. and guess I need a 100mb 'Android SDK' too
downloading thats gonna take awhile LOL