Double-click home button -- Am I really multitasking 50 apps?

I looked in the 200+ page iOS 4.1 manual on the Apple site. Sorry if I am overlooking something.
On multitasking, I understand that if one pushes the home button twice one sees the applications that are multitasking. Two questions:
1. When I do that, I see like 50 apps -- it seems more a "history." I didn't want to multitask them. I just closed them. Why are they there?
2. Are each of the 50 multitasking apps really consuming resources in background? Is it necessary to constantly go in and delete (turn off and thus remove from the multitasking screen) the multitasking apps to free up resources?
Thank you for considering my question. Sorry in advance if I am not clear on the concept.

Hi,
That task bar shows recently used apps. Very few actually run anything in the background. There are only a few services that can run when an app is not displayed. The iOS4 compatible apps can suspend and live in RAM until that RAM is needed. SOme will run location services or audio or in the case of Skype VoIP services.
The system is not keeping all those apps running. If you go to an app there or in it's home screen location they will start the same.
It's just a list

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