Have you gotten a lot of subscriptions via Kindle? And wouldn't it be great if your subscribers could also access unlimited graphics, photos, and/or videos associated with you books via Kindle without any change in the e-ink technology.
(Please start packing my Kindle now, Jeff!)
All I know is that my kindle book rankings (purchases) are doing really well. I think they rejuvenated my paper sales.
BTW, although the cover isn't up yet, my new book, "48 Liberal Lies About History" is now on Amazon pre-order and is doing ok, given that we're three months from release.