Great question. I have had these problems every time that I tried to use a discussion forum for classes (though mine are undergraduate): 1) encouraging active participation; 2) grading. So far, I have been unable to come up with a solution. In my ca…
A good list, but I prefer Diigo to Delicious. It has most of the same features but is better for collaborative learning with the ability to highlight and make comments on any web page that you share to a group. Very useful to make a classroom group.