Adding assignments is just one possibility. You can ask questions about the site, or have students carry on conversations about the text. Perhaps about the validity of some information. These notes can be made private (for your eyes only), public, or for a select group of people. You could use the same webpage for multiple classes, and have a different set of sticky notes for each one! Diigo will also create a separate webpage for each group you create, helping you organize your bookmarks/notes further! This technology is useful for any class, but I think is a must have for any group trying to organize something along the lines of the 1 to 1 projec