Scribus has put together a My Little Pony MUSH. For those unaware, a MUSH is basically a MUD, which is a text-based adventure game!
He says that the project is in open beta, and he's looking for ponies to test it out, and perhaps for larger roles as well, such as RPing the mane characters. He is also looking for moderators.
Check it out! The Ponychan thread is here.
You can also simply join the server by pointing your MUD client at equestriandawn.dyndns.org.