Collegewebeditor.com points out The Question, a blog by the Philosophy Department from West Virginia University.
The concept is simple: throw up a philosophical question, then get readers to give their thoughts in the comments. A few of their posts also have guest philosophers - young students of primary school age and more recently, their academic staff.
Most of the questions are sports-related, reflecting WVU's predilection for sport. Nevertheless, it's an interesting way to promote an academic discipline and to get people interested in philosophy.
P.S. I don't think this would work as a forum. ;)