On jailbroken devices, yes (it's been doable on the Touch for a while now, check the Kindle Dev forum). That would imply that, given a bit of time, it'll probably be doable on the PW.
On vanilla devices, never. (And to preserve both my sanity & temper, please don't mention kindlean to my face).
Last edited by NiLuJe; 10-04-2012 at 02:38 PM.