Gather.com

Gather.com is a great website!  I stumbled across it a few weeks ago and it is great for teachers as well as students.  It is a site where one can create groups and discuss specific topics or current events.  There are already teacher groups created as well as really interesting debate groups: "How important is higher education?" "The Effects of Smoking Pot".  It is very interesting and I could see a lot of healthy, educated classroom discussions stem from this sight.