Have been hearing more and more about low powered E-readers recently. Sounds like Sony will be releasing one very soon. Their screens may be bland, black and white, but they are flicker free; so easy on the eyes and they will last for a very long time on battery power. Newest addition that I came across is by a company called iRex and the product they have: The iLiad.
Looks like you will be able to write on it as well.
I have installed Microsoft Reader onto my Atom. As I have the Atom with me all the time, I find it convenient to get the PDA out during a free moment and start reading. Great for when riding public transport or a quiet moment at work and even for a quick read just before going to bed!
I think for the low-powered ebooks, the main advantage would be battery life and more screen area. Not sure I would find it convenient to carry around though. Productivity equipment for the office perhaps? Would any of you consider a product like this?
Link: iRex-The iLiad


