I just got a Barnes and Noble eReader (The Nook). That may have been a mistake. Oh well.
DH just got a Nook as well. He is very happy with it because he can put any pdf file on it and a bunch of other stuff as well as his own files (he worked at it for a few days). Kindle really ties you to only one format.
It wasn't for me. I love it.
Now, there's nothing that says we can't still buy real books -- I certainly will when I think it's something I want to keep. But the e-reader is great.
I particularly like it because of all the free books and PDF articles available on the web. I never liked reading them on the computer because you have to sit up. But with the Nook, I can download them and lay back and read as I would a paper book.
It's handy for traveling, too.