Blogging About The Web 2.0 Connected Classroom: Why Diigo Rocks!.
Diigo happens to be one of my favorite bookmarking tools. I have yet to use it very "socially." However, I do love the annotation tools it provides. I can sticky note, highlight, and write about specific sites on the internet. The blog-post linked above goes in much greater detail than what I am doing now. However, I always have to throw my two-cents in.