I’ve purchased a Sony Reader and am having fun with it. It’s about as big as a paperback book and the text clarity is very good. I’ve read books before on a PDA, but didn’t enjoy the experience because (1) the form factor was too small and cramped my hands and (2) you have to click the button to turn the page too often because the screen on a PDA is so small. The Sony Reader takes care of both these issues. It fits well in one or both hands and the large screen size enables almost as much text as you would see in a regular paperback.
I now have two goals to maximize my reader: (1) figure out how to easily reconfigure PDF files so they can be viewed on the reader and (2) create a solid digital library of great and enjoyable literature.