Cheaper Than A Tablet: 'Rooting' Your E-Reader
npr.org
npr.org
You can run Froyo, Cyanogen, or a Honeycomb version. And it's very hard if not impossible to brick.
If you are serious about wanting to root yours, I'd suggest putting Cyanogen on your EMMC, with it overclocked to 1.1. Very easy to do now that you can download ClockworkMod on an SD card and install Cyanogen, or anything else for that matter using it.
http://androidandme.com/2012/03/opinions/rumor-nexus-tablet-...
Some useful things you can do are 'desponsor' your ad supported kindle, add some useful navigation techniques (like user defined alt+character combinations to do common things or input characters you need), tether your 3g kindle via usb.
the main kindle rooting community i know of was not giving specific instructions on how to tether or disable the ads so presumably that helped limit how much of a problem it was for amazon.
but no, i haven't heard of any kindles being shut down for any reason
$200 android tablet with decent web browsing.
One drawback, no Google Android Market err umm Google Play market unless your root it.
One of my five year old's favorite toys...I get it back after he's asleep.
Supposedly, the firmware that the Kobo firmware is based on, does this, and some have successfully supplanted the latter with the former.
Take this along with the long-anticipated, now increasingly manifesting -- or publicized -- security failures of various "closed garden" phone/tablet environments, and I am increasingly disinclined to use, depend on, or support any such environment that is not open source and therefore amenable to some very common-sense functionality, by the community if and when the manufacture lets us down.
P.S. The Kobo firmware is at heart more or less Linux (although based on an intermediate party's customization of same). I'm frustrated at some things that Kobo has failed to offer, but at least there are ways past this (that don't even involve "jailbreaking", in its more legalesque meaning).