Being an avid book reader, I completely understand the buzz surrounding the Kindle. Browse the bookblogosphere and you'll likely notice it too. Plus, I've had the pleasure of experiencing one first-hand when a lady I was in jury duty was using hers.
It's a nice piece of hardware that allows people the ease to read hundreds of books at their leisure without having to actually carry the books around. And the screen is magnificent (a problem with previous e-readers and reading on computers is that it's quite tiring for the eyes).
That said, I don't know how many people will want to pay to read an RSS feed they can get for free--at least not in the IM or AM niches. In other niches, this might be an opportunity because sometimes people want to read their content while out and about. The Kindle would allow that. The downside, however, is that it's not a web browser, so any affiliate promotions could turn into missed opportunities since the content was not read on a computer. Hope that makes sense.
~ Teli