I picked up a Kindle 3 (aka Kindle Keyboard) a while back and have been thoroughly impressed with it. I love the fact that I can take half a dozen or more books with me when I travel without taking up a lot of weight or space in my luggage. While I wish the Kindle used an open standard like ePub rather than Mobi file format, given the large variety of books and reasonable prices, I can live with it. The only thing I don't like is that the Kindle is essentially a closed system and not very customizable. Nonetheless, there's a healthy community of open source hacks out there.
If you have a Kindle and are tired of the standard screensaver images of authors, you can install a Kindle screensaver hack with a couple of downloads. Just make sure you install the right version for your particular Kindle device.
I've posted some Kindle screensaver wallpapers on PicasaWeb of various novels, Mad Magazine covers and Infocom game covers. I couldn't find a good source of O'Reilly book covers, so I created some fake ones. And there are plenty of other Kindle screensaver wallpapers out there to chose from.