Apps Can Be Closed
Also I Hope they make it so you can remove recent apps in the app switcher.
I do wish that there was a way to easily close out the apps in the fast app switching view, but closing them is not difficult. From the six page view, tap the app you would like to close, then tap the back button. This closes it out. If you hit the start button, it leaves it in the fast app switcher.
This has been detailed by several reviewers, but I wouldn't bring it up if I hadn't witnessed it myself. I have tried this exact thing on two different Mango devices. Two friends of mine have Mango: 7712 on the Trophy, and 7720 on the Focus. Both had gotten them updated from Microsoft before it was available through XDA, or however everyone else is currently doing it.
Anyways, as I understand it, closing out these pages will not help things much anyways because the apps are not actually running at the time. The only exception that I can think of would be the music apps, and I suppose podcast players would fall into that same category.
This is how I understand it, but I'd like to more about the details.