I am getting more and more tempted by the latest Sony readers. Not for recreational reading where I much prefer leafing through a paper book. But for science reading, I hate having to print out stacks and stacks of paper to read journal articles and I hate reading them on the computer. From what I understand, the latest Sony lets you highlight or add comments to pdf files? That is the kind of function I really would find useful. A device that is light and easier on the eyes than a computer, but lets you carry around loads of pdfs without breaking your back, and lets you annotate pdfs as you are reading. Now if it also had a replaceable battery, that would be even better. Then I just have to wait for it to come down in price a little, and for more of the inevitable "new technology bugs" to be worked out.