Well my major complaint is that everyone goes "Why doesn't the Kindle have colour or a touchscreen?" when the answer is: "Because it's e-ink and it's really pleasant on the eye, and is black and white because that's what it is, and it's not a touchscreen because it's not possible with e-ink". Basically, e-ink is far better than LCD's, so any device with an LCD is missing the whole point of the Kindle.
E-Ink is great for e-books but I suspect a lot of folks, the ones who rarely read books, would prefer e-magazines, e-comic books, e-manga and web content in which case a color screen is very important. There's plenty of room for both but I suspect the more casual, multi-pupose approach, will end up being a bigger market.
