Fraser Speirs lays it out:

If someone tells you that all the apps in the multitasking bar are running, using up memory or sucking power, they are wrong.

A really great post with some superb information about how background apps work in iOS. I have never once tried to “manage” which apps are in the multitasking tray, but I have heard tons of people advise others to “quit” some apps.

Posted by Ben Brooks