Notifications have been one of the areas that Android has excelled in since day one. In Jelly Bean, that feature got a boost with the ability to expand a one-line entry, turning it into what is essentially a widget. Quickly happens to be one of the neatest uses we've seen of this new feature. This app creates a persistent notification in your shade that can be expanded to reveal an app launcher.
This app is a first release and the developer notes in the description: