Bukkit

What is the enhancement in mind? How should it look and feel?
If this is not already added, I think mobs riding other mobs will be a great addition

Please provide any additional information below.
Minecraft already has the built in mob riding feature, so it would be easy to add.
I think it would be cool if you can customize both mobs.
For example, I could have a zombie with speed 2 and the name Boomer,
with a creeper riding it, and the creeper is invisible. There are many more
things it could be used for, like a chicken shooting projectiles
(chicken with skeleton on top).
There are a lot of things to do with this, and I think players could use it to create amazing things / features.

Yeah I could totally do this in abilities. I had talked about it with friends before too. Will consider this when I start on abilities.