As I mentioned in the other thread, I was right on the verge of buying my wife a Kindle last year when I learned that you have to buy the books. Screw that. My wife reads 5 to 7 books a week!! With a Nook, she plugs it into her laptop, logs into our local public library and downloads 10 books and is all set in about 5 minutes. Best of all, I've not paid one single penny for any book and she has been able to get all the newest releases no problem.
I have a Samsung Epic phone and an iPhone. After having an iPhone since the day they came out, I'm surprised to say that, IMHO, the Samsung Epic blows the iPhone 4 away big time. Sure I can use the Epic for reading books just like a backlight Nook, but the screen is far too small to consider it for reading a book. I do download audio books and listen to them most every night from the public library as well. Most play on the iPhone, but it gets some books all screwed up and you'll go from chapter 6 to chapter 20. The Epic running the Android OS doesn't seem to have that problem neither does the el cheapo Sansa MP3 player I bought 3 or 4 years ago.
Anyway, after looking at all involved, I am amazed at how well advertising has worked for Kindle. My wife and I both are far happier with the Nook she has used literally every day for almost a complete year now.