Streaming
Streaming: http://constantvzw.org:8000/constant.ogg
BigBlueButton
Try BigBlueButton (requires Adobe Flash 11): http://bbb.constantvzw.org/
IRC
http://webchat.freenode.net/?channels=vj13 or #vj13 on irc.freenode.net
http://webchat.freenode.net/?channels=vj13-fr or #vj13-fr on irc.freenode.net
http://webchat.freenode.net/?channels=vj13-nl or #vj13-nl on irc.freenode.net
More about the selected transmission protocols here: tools