(posted from a computer)
After putting the Kindle 2 next to the original Kindle I can say
* the screens are not the same but as far as I care they are
* the Kindle 2 turns pages faster
* most other functions including shopping and downloading are about the same
Unique about the Kindle 2
* the side buttons press from the inside, not the outside
This makes it harder to accidentally press them, but also requires a slightly different action to use them, depending on your hand position. You can't press the buttons with you hand behind the Kindle.
* the 5-way requires a less-relaxed thumb position than the scroll wheel
more Kindle vs Kindle 2