Armed America and Black Demographic Data. (The pricing on the latter means that it probably isn't going to sell well.)
Compared to this, the Kindle my boss has is a brick! This is far thinner and lighter than any paperback.
UPDATE: And with a larger screen. I downloaded Republic: A Novel of America's Future by Charles Sheehan-Miles, largely because the Kindle edition was free, and I wanted to see how well this worked for reading fiction. The Kindle is growing on me as a way of doing pleasure reading.
Republic starts out a little clumsy; the author's method of explaining what is going on is a little pedestrian, but it is growing on me. He is telling a pretty good story, with people that you care about, and I found myself staying up late reading this in bed, when I should have gone to sleep--and that's a good sign that someone is a storyteller. Remember that there are great writers (in the technical sense that literary critics like), and there are great storytellers (like Stephen King), and sometimes you get both in one writer!
I do see a lot of annoying typos ("lot's" instead of "lots") and some rather surprising mistakes: the political party is "Democrat" with a capital "D"; newspaper titles are supposed to be italicized. The dialog, however, is quite good. Remember that real world dialog is never as grammatical or clear as novel dialog; we rely heavily on various non-verbal cues that prevent this from being a problem. A novelist has to improve on how people really speak--but not so much that it sounds stilted or implausible, and Sheehan-Miles is doing that pretty well.