You can't compare a laptop to a Kindle. You just can't. The electronic paper that it uses is in a league of its own. I can see comparisons to Sony's e-Reader or the iLiad, but if you can deal with a laptop for reading you're nowhere near the intensive reader that would benefit from something like a Kindle.
I haven't used an iLiad before. I've never heard of it. The picture Wikipedia showed makes it look ugly, as I said. However, the Kindle is significantly better than the e-Reader, which is the only other one I've heard to be a legitimately good product.