I know this might not be in same vein as you're discussing here, but as I was reading I wondered about a very different type of e-reader platform: consoles.
Has this been discussed on here? There is a huge market in the internet-connected Xboxes, PS3s, and Wiis out there. Why not have a e-reading application on the consoles? People would love to sit on the couch and read something on a big-screen HDTV... wouldn't they?
With the use of credits like MS Points and Wii Points, buying would be fairly simple. The concept is already there in the built-in marketplace systems.