Well, I did say I wanted a pony MMO.
Saltyjustice has sent in a playable demonstration script for another upcoming pony MMO project. It is significantly smaller than the 3D one I just posted!
You can get the details in the thread here, though you need to register. If you just want to jump in and play, you can grab the game here, or without sound here.
There's a video of it in action after the page break, as well.