I'd like to see a program that creates a model of my avatar - even a simple one.
It would be good to open a window that has an unshaded version of your avatar, and be able to drag and drop clothing and textures outside of the actual game, so you can see of you like the look of what you've created.
It's mainly to do with clothing, to see how things made in photoshop look on my avatar without having to upload textures at $10 a pop.