First and foremost, I think the inline comments feature is invaluable - but the current method of rendering the viewer / editor in a sidebar makes viewing / writing more than a couple of lines attached to the content being commented on difficult for the vision impaired.

As someone whose vision can only be corrected to 20/40, I make fairly heavy use of browsers' "zoom in" feature along with increasing the default operating system font size. With those two factors combined, the way that the inline comment editor / viewer currently renders as a right sidebar makes for a bit of a "scrunched" display (see attached - not even at most comfortable magnification for me). On a 24" monitor, even with the tools sidebar closed, the comments are blocked into a relatively narrow column down the right side.

What would be really helpful is an option to render the inline comment editor / viewer underneath the text that was highlighted. I've provided a very simplistic mock-up, showing the comment view pane below the paragraph that is highlighted with the inline comment. While a non-modal pop-over would be very cool, a bottom-docked pane for viewing and editing the comments associated with a marker would do the trick (almost like a split editor window).