Definitely a cool idea, but I'm the opposite. After a while, I start zoning out and skimming through sites on the web, but reading a book is easier.
One area of concern, though hopefully unfounded, is the affect this eReaders will have on the eyes in the longterm. I've needed corrective eyewear most of my life, and much of it was attributed to sitting too close to the TV when I was a kid. Sure, that's probably not true, and genetics may have had a bit more to do w/ it. Also, I haven't heard of any studies done since many of us are planted in front of computers all day. But between TV, computers, cell phones, and now even the way we read, is this too much?
Probably not, and I'm down for trying.