Of course, we don't know if "collections" is a hybrid of tags and folders ...
The PDF pan and zoom is a nice-to-have in a pinch to make SOME use of pdf ... but a Kindle 2 really is suited for that format. But, hey, zoom and pan is a plus.
I'm not sure how they get to more fonts and "improved clarity". It's nice to have a little choice in fonts -- a sans serif alternate, for example. I actually rather like the existing serif font. How do we get to "improved clarity"? Denser letters? Isn't that a function of e-ink?
I don't mind a password protect so long as I can turn it off and keep it off. I'm not concerned about the husband, or the cats, running amok with my Kindle when I'm not around.
But the last two: Facebook/Twitter and "see what the Kindle community thinks of interesting passages" ... sounds a lot like that blogger in another thread who had Big Ideas on How To Fix E-Readers. And will any of this apply to non-US Kindles outside of the US? On a clear day, from the top of a tower, I can see Buffalo ....