I love my Kindle! Most of these were read from there, though a couple were audiobooks (I'm also a big fan of iTunes), and of course, paper/hardback. These are some favorites:
The Truth War: Fighting for Certainty in an Age of Deception
John MacArthur
Jonathan Acuff
90 Minutes in Heaven: A True Story of Death & Life
Don Piper, Cecil Murphey
Tim LaHaye, Jerry B. Jenkins, Jerry B. Jenkins
I tend to read 2-3 books at a time on the Kindle, so more will be coming soon!