Karen has asked me to provide you all with more info on working with Diigo so that those of you who are a bit unsure about what you can do with it can get started. Below I’ve included some of its key features, but I strongly encourage you to visit their help menu, where you can access neat little flash tutorials on how to get started that are far better than anything I can whip up here.
Some Diigo Features:
Tagging: An easy, user-generated way to categorize and organize your bookmarks
Annotation: write sticky notes that can be made public so you can interact and collaborate with others who are reading the same pages.
Highlighting: Easy to highlight parts of pages, extract them, and collect them (great for research!)
Groups: you can create public and private groups—a great way to organize group projects and add a level of privacy to Diigo that you may feel more comfortable with than making everything public.
Privacy: Options for privacy are available on just about all Diigo features
Search: You can search not just by tag name, but also titles, notes, highlights, and full text.
Blogging Integration: “Blog This” feature allows you to move easily between browsing and blogging. Populate your blog post instantaneously with the highlighted texts you selected while reading a web page - a big time saver.
Archiving: Allows you to save EXACT copies of bookmarked pages, which protects you from losing cool stuff that may disappear over time.
Photos: You can collect your favorite photos into albums
Subscribe/Post Lists: Bookmark lists can be subscribed on the website and through RSS
Community: find new content from specific users or based on tags, hot lists
Group items tagged 
