Hey Sean. I LOVE Diigo. I want to echo the comment you and Amy made about tagging bookmarks from the start. It sure makes it easier to get my hands on a particular bookmark. I have shared several sites with teachers from Northside. I participated in an online survey about education that asked about the "online presence" that a student has - I think that is definitely something that resonated with me. I plan to look for more topics about it, and pass them on to this group.
I also wanted to see how the topic/chat feature worked.