Christine Robinson's Library tagged "web2.0 tools" →  View Popular, Search in Google

 With diigo, you can do most of what you can  with del.icio.us in terms of   saving  links with various tags, connecting to other users who have saved the    same post or used the same tag, and tracking  either users or specific tags (or   specific  tags of specific users) via RSS. Even more, however, is that like Furl,    diigo captures a copy of the page, so if it  disappears from the Web at some   point,  you can access it in your archive. 

 But what’s really different is the diigo  allows you to highlight certain   sections  of any Web page you’re on, and also gives you the ability to attach    sticky notes to the site. Those highlights and  notes are then visible should you   visit  that page again. But even better, if you have a diigo account and I have    “forwarded” the page to you, you can see them  add your own when you visit the   site as  well. Think digital feedback on student work.