When you look on the right side in the chat room it says users online. Great. But, that should be on all pages someplace (maybe the bottom?). I think you should be able to send a user a message if they are online (like a popup that fades away) to inform them that you will be on chat. Also, maybe you could make 2 columns, or 2 chat rooms. Kind of like how pictochat has rooms A, B, C, and D. It gets confusing having more than one conversation going on in one chat room.