Here’s a quick link-of-the-day with MacWorld’s take on an a number of the currently available e-book readers:
Personally, I’ve tried all of the Sony’s, the Kindle 2, and a couple of other e-ink based ones. In all cases, I found the screen flash on page turns quite frustrating. Ken tells me that you get used to it, but for me the iPhone still bests all of the other devices, as long as you aren’t trying to read PDFs. (And that’s not just because I’ve always got it with me.)
What I really want is an Apple tablet with a Pixel Qi-like display.