I am working on a comprehensive presentation introducing educators to all the awesome features of Diigo. Shhhh . . . there is big news coming from Diigo in the next two weeks (you can get a sneak peak in the last section of my tutorial.)
I will be presenting Diigo at the Classroom 2.0 LIVE Conference in Pennsylvania on Sept. 19th.
Here is another nice Diigo tutorial posted on SlideShare.