The Mushroom Kingdom could have a chat: Through ILS servers. Everyone would use an ILS connecter (such as NetMeeting) to connect to them. They would use the same username as they do on TMK. The ILS servers would be cool because it supports audio, video, file transfer, and a whole lot more!
If you are interested, here is a list of reliable ILS servers:
ils.onlink.net: This is a very nice server. It's not busy, and it's fast.
ils.demon.uk.co: This one is ok. It has a lot of users, but it is fast.
Dead I am the life, dig into the skin
Knuckle crack the bone, 21 to win
Dead I am the dog, hound of hell you cry
Devil on your back, I can never die
Dig through the ditches,
Burn through the witches
I slam in the back of my
Dragula