I own the Kindle and I've played with the Nook.<p>Nook felt odd, the touch screen wasn't very responsive and I had to press twice a few times. It felt a bit heavier too.<p>In regards to the features you want: Kindle boot-up is instant with a flickr (~2 seconds max) if coming from standby, which it goes into when you just leave it there after reading (or manually place it). Battery life is ok, but not the 3 weeks it's advertised as. Dictionary is a snap, just point the cursor to the word you need to know about and a little blurb shows up on the bottom of the screen; Simply beautiful and you can expand it to view more of the definition. Variety of book types are ok. PDF support is available, but I haven't used it yet because Kindle for Mac isn't out yet.<p>My girlfriend has been using the Kindle a lot as well for reading novels, myself mostly the paper and we both are in love with it. There's a lot of small, neat things that it does a good job at, while being awesome at being a reading device that you can forget about and focus on your material.