5. It's all in the toolbar! Example: http://serendip.brynmawr.edu/sci_edu/waldron/ Bookmark, Tag, Highlight and leave a little yellow sticky! Then you can even share it via Twitter, Facebook, Google Buzz, or email it!
6. Example of a Diigo "conversation"! http://www.diigo.com/annotated/61194ca2563c5347ebb25051186818b8