there's not really a huge difference.
Have put up a post with kindle 3 and nook photos -
http://ireaderreview.com/kindle-3-la...s-nook-photos/
Also here's a post that has a list of all categories of photos -
http://ireaderreview.com/2010/08/25/...hoto-overload/
The latter includes links to
kindle 3 vs sony, nook, othe ereaders.
the new lighted cover, etc.
The Nook was around 15% better than Kindle 2 plus had the black border around the screen.
So Kindle 3 might be 40% to 50% better than Kindle 2 International. However, for Nook the difference is smaller and the blakc border means Kindle 3's Graphite casing doesn't have as much of an impact.
The screen is clearly better - however, the difference isn't as big.