Marcus over at Brazilian site Music Apps has news of a great new jailbreak app! Quasar, $10 on Cydia, allows for apps to be windowed. You can resize them with ease and have apps sitting next to each other! Check out this demo video, that has GeoSynth controlling iMS-20 via MIDI Bridge, while simultaneously playing Animoog.
Perhaps most impressive is the fact that he's doing all of that on an old iPad 1! Google Translate does a poor job of Portuguese to English, so I don't want to try speculating too much on what all is said. Here is the full article.