Last Christmas Laura gave me a Kindle as a gift. Although I prefer an actual book, it was great for my train ride to and from work. What I like best about it is being able to download a book on the spot.
Here is a list of books I read last year via Kindle:
The Holy Bible (i didn't read all of it! just select chapters)
5000 Year Leap by W. Cleon Skousen (read this one twice)
The Death and Life of the Great American School System by Diane Ravitch
Everyday Justice: The Global Impact of Our Daily Choices by Julie Clawson
Following Jesus by NT Wright
Grace Notes by Philip Yancey
Obama Zombies by Jason Mattera
The Road to Serfdom by F.A. Hayek (still finishing up)
Rush Limbaugh: An Army of One by Zev Chafets
Various Chapters of the NYC Building Code
The Barnes and Nobel Nook is much more impressive. I'm sure these devices will only get better as the months go by.