Here are some free online public chat options...

http://free.123flashchat.com/room/Lobby
http://www.everywherechat.com/
http://en.12allchat.com/chat/
http://www.worldofchat.co.uk/main-chatroom/

chat is available for those that have an account at Psych Central - or you can make an account if you want to chat there.. - http://forums.psychcentral.com/