But the Facebook and Twitter integration, and Popular Highlights features! Stuff almost nobody was asking for, but I think it is pretty revolutionary, and really sets Kindle apart in a big way (at least for awhile). It's good to see someone in this space making a move in social networking.
I could care less about Collections (as long as it doesn't get in my way, it's fine I guess...), but what about Cyrillic or Han support? any reason to hope they've added it since they have updated the fonts? Or pan/zoom for viewing DX size images on K2 (or with the hidden image viewer)?