This is great. When reviewing/editing/revising technical manuscripts (journal articles, technical reports, dissertations etc) this would be extremely handy, and

This is great. When reviewing/editing/revising technical manuscripts (journal articles, technical reports, dissertations etc) this would be extremely handy, and cut out the constant scrolling to check and recheck definitions and parts of the document with others. Referring back to the materials and methods section is an obvious use-case. Would be nice to see the layout of comments/notes etc on the RHS be more structured (snapped to a grid?) though. Shouldn't have to zoom in and out on these. Now if this was combined with one of those Wacom 24 or 27" touch screen displays ... :)