I won't buy a Kindle because of their policy of removing books from your library. Not to mention that books bought through Amazon are DRM protected and only work on the Kindle. I like the Nook more, but its not in Canada (and we don't have B&N stores here). Maybe I'll look into the Chapters eReader.
I'd love to be able to access my entire library from one device. I also wouldn't have to carry 2 books around when I'm nearing the end of one. And the reader should be lighter than a single decent sized book. As long as my books are not tied to a specific reader so I can move to different types down the road without losing my library, then I definitely want one.