Which is better the Amazon Kindle 3 or the Barnes & Noble Nook 3G - WI-FI (Ereaders)?
I personally know of many people that are very happy with the Amazon kindle. The screen is nice sized, and it is also a very user friendly option for reading on the go.
Barnes & Noble has one foot in the grave (they are closing store after store). Stick with Amazon; the Kindle is better and they'll be around to support it.
With the Nook you can get free file sharing from the library.