That's what my Kindle has become! For Christmas my husband got me the Kindle and I absolutely LOVE it! It came in a couple weeks early and he wasn't home when it was delivered so... I opened it early and I haven't been able to put it down since. It's so slim and compact so I take it everywhere. Since I've been going to a lot more doctors appointments lately I've been getting plenty of reading done in the waiting room.
I have a Sony reader that I got years ago and in comparison, it's only okay. The wireless option of the Kindle is awesome and I love being able to download books without worrying about hooking up my ereader to my computer. With the Kindle, I can download anywhere I can find a wireless connection (which isn't hard) so it's doubly nice if I'm traveling. In addition, Amazon is always offering free books. Technically I think it's the publishers but I like that when a big author has a new release, they'll often offer one or more of their books for free via the Kindle for a limited time. I've discovered a few authors that way and I've been able to download some of my favorite authors' back list books. And it's something I haven't found that Sony offers (though I could be wrong).
So far, I think my favorite application is the ability to separate my books by genre. I've got about 10 genre separations and while the classification system still needs some tweaking (they don't alphabetize the books by author or title so with a big collection I imagine it's annoying) it's very nice to be able to file all paranormal or erotic romance books together.
I know so many people who got the Kindle for Christmas. Do you have one? What do you think of it? Or do you have another ereader?