diigo

Bookmarks websites and annotates them with stickynotes, highlights and comments. All these can be shared with other Diigo users including PDF documents, although a very small annual charge has been introduced to prevent spamming - the free version has a CAPTCHA for sharing. It is useful for research where quotes can be selected and commented upon as well as tagged for future use - helps organisation.

Reviews

Date Average Score Version of Tests Results
17 May 2012 73% Version 1 Results
10 August 2009 80% Version 1 Results