I am interested in being able to mark a bookmark as viewed. I want to easily see which bookmarks have been looked at from either the ribbon or the catalog pane. Example, I right click and in addition to update and remove bookmark, there is a mark as viewed option. This would then display some type of check/symbol in the thumbnail to easily show the bookmark has been looked at. In the catalog pane the details drop down symbol could change for bookmarks that have been marked as viewed. In a long list of bookmarks it is easy to lose track of what has already been looked at.