Comments from those who selected
diigo as one of their Top 10 Tools in 2008

• "Free. With the use of diigo
  and the automatic export to del.icio.us you gain a great
  Social Bookmarking + Social Annotation tool The best way
  to collect, share and interact on online information
  from anywhere." 
  Andreas Büsing


• "Diigo
  
  
  is my primary social bookmarking tool and how I generate my
  daily bookmark posts for my blog. I do so much online
  research for both the courses I develop and for my own
  personal learning; a good system to track all the resources
  I find is indispensable. Diigo’s also improved a lot since I
  started using it, and they’ve learned to take user feedback
  seriously." 
  
  Christy Tucker


• "Sorta like del.icio.us, but enhanced for
  teams. I've created Diigo groups for several work
  teams to use as our social bookmarking tool." 
  Matt Lisle