Teaching social bookmarking is the topic of this K-12 blog entry. Tells how and why to use Diigo educationally, but can be applied to other, similar applications.
"How I use Twitter, search, Diigo Delicious, DEVONthink, Scrivener to find, refine, organize information -->knowledge"
A nice illustration in a Screenr screencast of how a Stanford professor uses various online tools to organize Internet information.
A monthly blog from EFL Classroom that gives you ideas, resources, and a place to set up your own online classroom. Links to video talks, new online resources, ongoing discussions and blogs, student-created content, ideas for current seasonal holidays, and their own Diigo Group, et al. EFL Classroom has developed well over the past year or so, and is well worth following.