I have a Kobo which is already pretty open from the start and I can install Koreader, Plato and other softwares on this thing without having to jailbreak it. But this is a really cool thing, and now I may hunt the marketplace for a cheap used Kindle and install Koreader on it without having to worry about which version it has.

Wait until they replace the second option of the Desktop right click menu to something AI.

I usually use SlavArt to download MP3s and FLACs from streaming services: https://doubledouble.top