Thanks for the link and info!
While I'm sure it's correct for many apps, for others it's not. As I said above, when you click the back (arrow) button, it triggers the finish() event. Some apps will shutdown when it's triggered, but others override it and remain in memory.
What's more TasKill pretty much confirms this behaviour. Google SkyMap will vanish from TasKill if you close it with the back button, but the Last.fm app does not. There's good reason for the Last.fm app to behave that way though because it constantly monitors the music player, caching and sending listening data to your last.fm account. (You can stop it doing that though by unticking its 'scrobbling' option.)
Unlike the back button, the home button never seems to trigger the finish() event in apps at all.
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