Wmcmanus: When I got my Kindle (DX), I was just planning to use it to keep all the papers I would ever need for research (in pdf format) so I would have them at my disposal wherever I might be. However, I found that the Kindle is really nice for reading actual leisure books... much better than a real book for me. I tend to read at night before I go to bed. I would always fall asleep while reading, losing my place. Now the Kindle turns itself off and remembers what page I was reading. Also, it is really nice to be able to change the font size (on Kindle books) especially as one gets older. It would be hard to go back to those old paperbacks now.
I just wish I could make the font bigger on pdfs and I would be a happy (er happier) person.