Congrats to your brother! How cool!

I have both a Kindle and a Nook. They are not compatible. However; as been posted, if you have a smart phone, iPod Touch/Pad or computer you can download the apps for free. If you can read on a small screen, I love my Incredible or Touch. Easy and portable.

I still love holding a physical book, but I can store more in the Nook and Kindle.

I wish I could test out the new Nook as it still keeps the e-ink technology with a touch screen but don't live close enough to check it out. That would be tempting if it works.

I like my Kindle more than my Nook as it keeps it battery forever and it's easier to use. The Nook just isn't that fast and responsive with the touch part.