Hey Clay,
From a teacher - thank you, thank you, thank you! I am a Diigo newby and wanted to use Diigo to demonstrate a "think aloud" (explicitly modelling my thinking processes) as I critically evaluate web content. I still haven't created that screencast (I use Jing), but yours is a great intro to share with both students and staff. Interactive and modeled reading of the web is, I think, key to supporting the development of critical thinking skills.
When you think of the higher order thinking skills required to thrive in the 21st century - analysis, synthesis and application - Diigo is a wonderful tool for demonstrating what these skills look like. Students learn best when skills and processes are modeled - all facilitated by the bookmarking, highlighting and commenting capabilities.
If you don't mind, I will share your video through my blog later today!
Phooey on the UCLA research on literacy and critical thinking ;)
p.s. Being from Canada, I had difficulty setting up my Diigo education account, but got great support from the folks at Diigo and I am set to go.
p.p.s. Hope you enjoyed the tennis.