Overall (personal) note, there are several screenshots that are not full Grooper screenshots. I am not a fan of these, as I think it's easy to not be sure where that "snippet" of a full screenshot exists.
For example, the Interface Tools section uses a full screenshot, then snippet screenshots to point out specific buttons. I think the next section, the Zoom Tools uses a supademo to do in one thing what those several snippets did, and eliminates this issue.
Another opinion, but I think this whole article could be done with a bit of text early on explaining what the Document Viewer is, then one supademo that says what all the navigation buttons are. I would still have the text of that supademo as bullets before the demo.
The About section uses an old "text-next-to-image" table format we used to use. I don't think we use this anymore.
