Put a PixelQi display in one of these devices and you have a great ebook/reading device:
http://tabletkiosk.com/products/sahara/i400s_pp.asp
Yeah, the price is waaaay too much for a "reader" but they have been making them for a few years now, they are super devices, offer everything a full PC does, well since they are actually PC's that is a given I suppose. Add a lower energy display make some basic changes to the onboard data storage (as in using an SSD which a 32GB 2nd gen drive is pretty cheap these days and more than enough as a casual device) and viola you have a device you can use for a full day of work/reading...
The evolution of the display tech but also storage of data and batteries will merge these Slate PC's with the current reading devices in less than a couple years, and at a price point near what readers are today.