I like the chat feature, but I would like it to be separated/complimentary to the sharing feature. I would prefer the sharing feature be the primary vehicle and then if people wanted to 'chat' around a particular note or notebook, that would be functional. Right now, the blended function does not allow discrete discussions around the shared notebook or content, which limits the value of the chat feature. Further, I agree with others-- sharing is NOT the same as chatting in concept or in action.
I would like to have a customizable toolbar as well. This would be an extremely useful feature for me. I do a lot of text formatting in my notes, and I would want to have more of the text formatting icons in my toolbar.