I dunno about chatrooms improving your spelling. I have noticed it tends to have the opposite effect on a lot of people. Will do wonders for typing speed though.
i just downloaded free chat room and tryed on my site it seems to work fine why carnt jc do this type of thing here is addy http://chat-forum.com/freechat/index.htm
that is our chat room, made it today, works a treat
you will need to join, and download some little .exe thing, it's a 1 off download, and joining is a one of thing also
i request all members use their forum name, saves the hearache and hastle of not knowing people