I own a Nook and love it.
It runs a version of Andriod OS, has a touch screen interface instead of a keyboard, has a user replaceable battery (unlike Kindle) and is a much more open platform than Kindle overall. The Wi-Fi only version is $150.
B&N is getting behind it with alot of freebies too. For example, you can read ebooks for free instore for an hour a day. And up until recently you could show your Nook and get a free coffee in store.
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