The Duncan Trussell Forum's Writers' Warren

My favorite comedian and podcaster, Duncan Trussell, has a forum that attracts a lot of cool and interesting people.  There's very little petty bickering and unwarranted cyberspace name-calling there.  For writers, too, his subpage "Writers' Warren" is a great place to go and share your work.  People there are good at balancing their criticisms with compliments.