I have a nook, which I bought before the new Kindle came out. I bought that because I am running out of room for books, and there are just some books I won't read again (some business, novels, etc.). I like the nook because I can replace the battery myself, and it does have a feature where I can lend a book for 14 days to other nook owners.

That said, I just bought my mom a Kindle this past mother's day. Don't know how your mom's sight is, but my mom is your typical technology-challenged mom, and her eyesight is getting worse. She is in LOVE with her Kindle. She can change the font size, and it is easier to hold than a heavy book. It's the best gift I've ever been able to get her, and she's hard to shop for.

If I were to buy myself another reader, I'd buy a Kindle this time around, but I still use my nook a lot.