Easy to use. Lots of space. Adjustable back light so you can read at night and during the day. Can do some music files, so you can listen to music while reading (or audiobooks at other times.) It has limited video file capability so you could theoretically watch movies (though I haven't tried really, I know it doesn't do .wmv files). It has a slot of SD cards to increase storage space. AND you can browse the web with wifi or home networks. I frequently browse RAFO.

But my favorite is that I can shop Barnesandnoble.com using it and download straight to the Nook.


EDIT: Also does TONS more file types than the Kindle, so it doesn't matter as much what file type your book or document is in to read.