I've been working on this for about two-three weeks now and it is just about complete. Please drop me a comment if this is a project that you are interested in.
What I wanted out of this was a clean user interface that can combine all of my android systems emulators into a single pane of glass. This makes the emulation experience as seamless as possible and allows you to use emulators that were sideloaded without having to jump down to the build menu.
As a user, you have to install the emulators you want to use, configure the app with the directories that contain each systems games, and any BIOS that are required, and the app does the rest ... unless you named all of your games in insane ways, then you may have to be a little more proactive when the app is pulling the metadata.
The app uses intents built into the emulators to directly launch the selected games so the emulator has to be compatible. Right now all of the "oid" emulators are compatible as well as FPSE and EPSXE. I have been in contact with a few devs including those that have emulators on the Ouya and all seem open to the idea but I can't guarantee when the compatibility will be introduced.
Between this app and the autopilot app you should be able to turn your Ouya into a relatively seamless emulation experience.
The app will let you use one system of your choice fully functionally for free and if you like the feel of it and the performance, $1 will net you the rest of the systems you didn't choose for the demo.