Thanks for the link, that helps a lot.
To be honest, I'm surprised at how either reader has gained so much popularity. Just a few months before the kindle was released e-books were all but dead.
Personally, I'm not entirely sold on the idea, as I like to re-read books, take them places that are not safe/convenient for a read. I can see in some situations where it can be advantageous.
Given the fact that the nook is out second means it can learn from the Kindle's shortcomings but B&N needs to get it out to market without any hiccups and it appears that's not the case.