Maybe these links will help you decide:
http://news.cnet.com/8301-17938_105-20009738-1.html

http://www.buzzle.com/articles/kindle-vs-nook.html

My best friend has a Kindle and loves it, but wishes it was backlit to read in different lighting conditions. Maybe the new ones offer that? But then I heard that a backlit screen can bother your eyes if used for long periods, so who knows?

I like having a paperbook in my hand, and I don't normally buy books. I use the library or trade books with friends. My son downloads books onto his iPhone and charges them to my credit card. If you read a lot like he does, you're likely to spend quite a bit on costs.

I never re-read a book, so this just doesn't make financial sense for me.