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it has a lot more features than my current favourite, del.ico.us:- Longer description when bookmarking pages.- Saving bookmarks to Twitter (if you are into that!)- Web links can be automatically saved to del.ico.us and 3 other social sites.- Instant bookmarking of a web page (one click save)- The toolbar has an icon which shows whether the site has been bookmark previously.- Bookmarks can be tagged read/unread status- There are highlighting and collaborative features like sticky notes and site comments/- You can import from other social bookmarking tools (del.ico.us, magno.lia.com, furl, etc)- Images can be clipped and saved.- Embedded videos can be captured and saved (supporting youtube.com, myspace.com, video.google.com, video.yahoo.com, atomfilms.com and many others)- You can send bookmarks to major blog platforms easily (one of my favourite features)- Cached feature: archive of the original bookmarked webpage can be accessed- Diigo's Site Communities aggregate users who bookmark & annotate the same website & build meaningful reader communities.-Dashboard: A quick glance of all the latest activities from you and your friends on Diigo. Check out public bookmarks and annotations your friends have added, see what groups they have joined or created, and other interesting activities they are doing at Diigo. also shows you all of your incoming messages, friend request, group invites and more.