What can you do with it?
Bookmark
Share (RSS/Blog It)
Annotate

Links
Miz Mercer's Diigo Links (bookmarking with tags)
ELD Website (RSS of bookmarks to blog)
Video on how to use Diigo for blogging about stuff

And, check out the annotations on these sites bookmarked here.

http://www.diigo.com/list/mizmercer/sixth-grade?ec=0