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So it would be helpful to compare any new entrant in the space to Diigo. If webnotes is aiming at serious web surfers, then I must say that side-by-side comparisons would show that Diigo is a much more powerful (and mature) tool. For example, Diigo provides rich tagging capability as well as folders for better information organization, and group annotation for better collaboration. Diigo automatically caches the page so it is always available to you. Diigo allows you to search the full-text of your collections, or just within your highlights. Diigo allows you to easily extract your research findings or publish them to blogs …..

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One could argue that webnotes’ is simpler because of less features. Well, if you want real productivity, I should like to argue that it just falls far short of what Diigo enables. In addition, Diigo’s rich functionality has been designed with painstaking care so that if you will be completely comfortable just using a subset of the features to begin with. For tools that are really simple, I would say delicious and google notebooks are hard to beat.

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Diigo team continues to dedicate itself to make Diigo the best tool for research productivity and knowledge sharing. (In the meantime, other web annotation tools such as fleck, i-lighter, jump knowledge, trailfire, etc have essentially stopped development or simply shut-down, to the best of my knowledge. )