Other aspects of Diigo that are useful:

Group annotation of webpages. (I think we should play around with this as a Diigo group.)

Annotation extraction: once you have highlighted and annotated a page you can extract those notes. I use this in my classes when teaching summarizing skills and I use it myself to write blog posts. (I think it would be fun to do a group annotation of an article/post and then collaborate on a post or alternatively annotate a post and 'cheat' by using each others notes without attribution in our 'own' posts and then reflect on how that feels.)

Auto blogging: you can highlight and annotate a page and then create a 'job' that will automatically send it to your blog. Or we could create a group blog for a day, give each other the blog access and use Diigo to share in a 'rhizomatic blitz/.

I am always a little surprised that more folk don't use Diigo.

I love the autoblogging tool. I use it to post links to my blog. Come join us in annotating Dave's post here: http://davecormier.com/edblog/2008/06/03/rhizomatic-education-community-as-curriculum/