With the danger of focusing this blog a bit too much on iPhone and iPad related posts, here’s my mockup of how the upcoming iPhone OS 4 application switcher might look.
Some reports are suggesting that a double push on the home key would bring this up, globally, regardless of what is the current app. This would follow, in my mind, as an extension of what double pushing the home key does now, i.e. switching to the iPod etc..
Additional options under the arrows might be to quit the app directly, or specific functions made available by the app, such as pausing music.
I reckon they’ll just integrate this into the home screen, perhaps marking icons for open apps in some way.