Diigo has long been a favorite tool of mine for bookmarking and collaboration. Diigo easily passes my criteria for adding a tool to my toolbox. The tools I use have to do a number of things beyond basic stability and usability:
1. Save time by automating manual stuff, or taking advantage of work I’m already doing.
2. The tool or mashup has to be easy and quick to use. One or two clicks, less than 30 seconds.
3. Foster real connection, collaboration and participation.
Now Diigo has added another reason to love them, integration with Wordpress, (and other blogging platforms).