I think the tag cloud is interesting. I prefer the delicious cloud where there is a size visual, however, this one is nicely organized. Several of the tags were brought in by delicious, which may have skewed the results. I wish there was a way to select tags in a hierarchical fashion. E.g. select chemistry, then select visual aides and end up with all the pages tagged with chemistry that also tagged visual aides. A bit of Boolean logic is always a plus. It is nice to be able to see any annotations listed, however, some of them are inappropriate. It is nice to be able to limit viewed annotations to friends and myself.

I have made 5 lists for Diigo use: Notes (which contain practice worksheets, online quizzes, etc.), Tutorials (videos, animations, webquests, guided sites), Reference, Study/organizational strategies, virtual (classes, labs, or demonstrations). I originally created a list based on my content topic, but I don't think that would be as efficient. I would rather say: "I need a visual for atomic theory" and look up tutorials, then atomic theory.