I came across chatroomcity through the recommendation of a friend. It has a neat, straightforward and intuitive interface. Apart from the main chat room, 5 other rooms are accessible (including a Quiz room). Its well managed and very well moderated without being excessively "big brother-ish". Chatters there are friendly and welcoming and treat one another with respect. It has other features too such as a forum where chatters can post news items, a "friends wall" where one can post "thoughts of the day" etc.