I have had a kindle for almost 2 years, I LOVE it!
We travel a lot, and its so nice to always be able to get a new book.
The very best feature about kindle, which I don't think anyone has mentioned yet is you can have more than one kindle on your account. We have 5 (me, my mom, 2 sister in laws, and a friend), which means we share everything.
The ONLY things you don't share are blogs, magazines, and newspapers, but I honestly don't think any of us even have those.
I LOVE my kindle, I LOVE being able to download a few chapters to make sure I like it. I love the wifi, I have a kindle one, and I did have a few problems this summer with wifi, and getting books. (we also did a 8 week vacation, from coast to coast, and hit some really quiet places), but with that being said...my mom has the newer kindle, and she was on the same trip...and never had a wifi problem. With the second generation kindles, they have better access. But, i am not willing to upgrade because it really was not an issue (and I LOVE that mine has a memory card slot, where the newer kindles do not).
I know one of the big sells on the nook, is that you can "share" your books with others...well, if you look closesly into that...you can share, one book at a time, you can only share a book once, and only for 2 weeks, and while that book is being shared you can not access it.
We have almost 10 book on our kindle, and I would say almost 70 of them have been free. I check the free books on
amazon almost daily. And, lots of them have been really good.
From the looking around I have done, the books are almost always cheaper on amazon too.
Good luck, I am sure you will love which ever you get!